diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4987b96e1..4e647a262 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -325,6 +325,7 @@ set(COMMON src/common/logging/backend.cpp
            src/common/error.cpp
            src/common/error.h
            src/common/scope_exit.h
+           src/common/fixed_value.h
            src/common/func_traits.h
            src/common/native_clock.cpp
            src/common/native_clock.h
@@ -563,6 +564,7 @@ set(VIDEO_CORE src/video_core/amdgpu/liverpool.cpp
 
 set(IMGUI src/imgui/imgui_config.h
           src/imgui/imgui_layer.h
+          src/imgui/imgui_std.h
           src/imgui/layer/video_info.cpp
           src/imgui/layer/video_info.h
           src/imgui/renderer/imgui_core.cpp
diff --git a/src/common/fixed_value.h b/src/common/fixed_value.h
new file mode 100644
index 000000000..e32a795f2
--- /dev/null
+++ b/src/common/fixed_value.h
@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+/**
+ * @brief A template class that encapsulates a fixed, compile-time constant value.
+ *
+ * @tparam T The type of the value.
+ * @tparam Value The fixed value of type T.
+ *
+ * This class provides a way to encapsulate a value that is constant and known at compile-time.
+ * The value is stored as a private member and cannot be changed. Any attempt to assign a new
+ * value to an object of this class will reset it to the fixed value.
+ */
+template <typename T, T Value>
+class FixedValue {
+    T m_value{Value};
+
+public:
+    constexpr FixedValue() = default;
+
+    constexpr explicit(false) operator T() const {
+        return m_value;
+    }
+
+    FixedValue& operator=(const T&) {
+        m_value = Value;
+        return *this;
+    }
+    FixedValue& operator=(T&&) noexcept {
+        m_value = {Value};
+        return *this;
+    }
+};
diff --git a/src/core/libraries/system/commondialog.cpp b/src/core/libraries/system/commondialog.cpp
index e32e3bb3f..e11f6791c 100644
--- a/src/core/libraries/system/commondialog.cpp
+++ b/src/core/libraries/system/commondialog.cpp
@@ -8,6 +8,9 @@
 
 namespace Libraries::CommonDialog {
 
+bool g_isInitialized = false;
+bool g_isUsed = false;
+
 int PS4_SYSV_ABI _ZN3sce16CommonDialogUtil12getSelfAppIdEv() {
     LOG_ERROR(Lib_CommonDlg, "(STUBBED) called");
     return ORBIS_OK;
@@ -83,14 +86,16 @@ int PS4_SYSV_ABI _ZTVN3sce16CommonDialogUtil6ClientE() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceCommonDialogInitialize() {
-    LOG_ERROR(Lib_CommonDlg, "(DUMMY) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceCommonDialogInitialize() {
+    if (g_isInitialized) {
+        return Error::ALREADY_SYSTEM_INITIALIZED;
+    }
+    g_isInitialized = true;
+    return Error::OK;
 }
 
-int PS4_SYSV_ABI sceCommonDialogIsUsed() {
-    LOG_ERROR(Lib_CommonDlg, "(STUBBED) called");
-    return ORBIS_OK;
+bool PS4_SYSV_ABI sceCommonDialogIsUsed() {
+    return g_isUsed;
 }
 
 int PS4_SYSV_ABI Func_0FF577E4E8457883() {
diff --git a/src/core/libraries/system/commondialog.h b/src/core/libraries/system/commondialog.h
index 110e9cc99..6b8ea3d95 100644
--- a/src/core/libraries/system/commondialog.h
+++ b/src/core/libraries/system/commondialog.h
@@ -11,9 +11,44 @@ class SymbolsResolver;
 
 namespace Libraries::CommonDialog {
 
-struct OrbisCommonDialogBaseParam {
+enum class Status : u32 {
+    NONE = 0,
+    INITIALIZED = 1,
+    RUNNING = 2,
+    FINISHED = 3,
+};
+
+enum class Result : u32 {
+    OK = 0,
+    USER_CANCELED = 1,
+};
+
+enum class Error : u32 {
+    OK = 0,
+    NOT_SYSTEM_INITIALIZED = 0x80B80001,
+    ALREADY_SYSTEM_INITIALIZED = 0x80B80002,
+    NOT_INITIALIZED = 0x80B80003,
+    ALREADY_INITIALIZED = 0x80B80004,
+    NOT_FINISHED = 0x80B80005,
+    INVALID_STATE = 0x80B80006,
+    RESULT_NONE = 0x80B80007,
+    BUSY = 0x80B80008,
+    OUT_OF_MEMORY = 0x80B80009,
+    PARAM_INVALID = 0x80B8000A,
+    NOT_RUNNING = 0x80B8000B,
+    ALREADY_CLOSE = 0x80B8000C,
+    ARG_NULL = 0x80B8000D,
+    UNEXPECTED_FATAL = 0x80B8000E,
+    NOT_SUPPORTED = 0x80B8000F,
+    INHIBIT_SHAREPLAY_CLIENT = 0x80B80010,
+};
+
+extern bool g_isInitialized;
+extern bool g_isUsed;
+
+struct BaseParam {
     std::size_t size;
-    u8 reserved[36];
+    std::array<u8, 36> reserved;
     u32 magic;
 };
 
@@ -32,8 +67,8 @@ int PS4_SYSV_ABI _ZNK3sce16CommonDialogUtil6Client8getAppIdEv();
 int PS4_SYSV_ABI _ZNK3sce16CommonDialogUtil6Client8isFinishEv();
 int PS4_SYSV_ABI _ZNK3sce16CommonDialogUtil6Client9getResultEv();
 int PS4_SYSV_ABI _ZTVN3sce16CommonDialogUtil6ClientE();
-int PS4_SYSV_ABI sceCommonDialogInitialize();
-int PS4_SYSV_ABI sceCommonDialogIsUsed();
+Error PS4_SYSV_ABI sceCommonDialogInitialize();
+bool PS4_SYSV_ABI sceCommonDialogIsUsed();
 int PS4_SYSV_ABI Func_0FF577E4E8457883();
 int PS4_SYSV_ABI Func_41716C2CE379416C();
 int PS4_SYSV_ABI Func_483A427D8F6E0748();
diff --git a/src/core/libraries/system/msgdialog.cpp b/src/core/libraries/system/msgdialog.cpp
index 452feec93..a0cb9e405 100644
--- a/src/core/libraries/system/msgdialog.cpp
+++ b/src/core/libraries/system/msgdialog.cpp
@@ -1,54 +1,224 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <imgui.h>
+#include <magic_enum.hpp>
+#include "common/assert.h"
 #include "common/logging/log.h"
 #include "core/libraries/error_codes.h"
 #include "core/libraries/libs.h"
 #include "core/libraries/system/msgdialog.h"
-
-#include <magic_enum.hpp>
+#include "imgui/imgui_layer.h"
+#include "imgui/imgui_std.h"
 
 namespace Libraries::MsgDialog {
 
-int PS4_SYSV_ABI sceMsgDialogClose() {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    return ORBIS_OK;
-}
+class MsgDialogGui;
 
-int PS4_SYSV_ABI sceMsgDialogGetResult() {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    return ORBIS_OK;
-}
+using CommonDialog::Error;
+using CommonDialog::Result;
+using CommonDialog::Status;
 
-int PS4_SYSV_ABI sceMsgDialogGetStatus() {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    return ORBIS_OK;
-}
+using OrbisUserServiceUserId = s32;
 
-int PS4_SYSV_ABI sceMsgDialogInitialize() {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    return ORBIS_OK;
-}
+enum class MsgDialogMode : u32 {
+    USER_MSG = 1,
+    PROGRESS_BAR = 2,
+    SYSTEM_MSG = 3,
+};
 
-s32 PS4_SYSV_ABI sceMsgDialogOpen(const OrbisMsgDialogParam* param) {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    switch (param->mode) {
-    case ORBIS_MSG_DIALOG_MODE_USER_MSG:
-        LOG_INFO(Lib_MsgDlg, "sceMsgDialogOpen userMsg type = %s msg = %s",
-                 magic_enum::enum_name(param->userMsgParam->buttonType), param->userMsgParam->msg);
-        break;
-    case ORBIS_MSG_DIALOG_MODE_PROGRESS_BAR:
-        LOG_INFO(Lib_MsgDlg, "sceMsgDialogOpen progressBar type = %s msg = %s",
-                 magic_enum::enum_name(param->progBarParam->barType), param->progBarParam->msg);
-        break;
-    case ORBIS_MSG_DIALOG_MODE_SYSTEM_MSG:
-        LOG_INFO(Lib_MsgDlg, "sceMsgDialogOpen systemMsg type: %s",
-                 magic_enum::enum_name(param->sysMsgParam->sysMsgType));
-        break;
-    default:
-        break;
+enum class ButtonId : u32 {
+    INVALID = 0,
+    OK = 1,
+    YES = 1,
+    NO = 2,
+    BUTTON1 = 1,
+    BUTTON2 = 2,
+};
+
+enum class ButtonType : u32 {
+    OK = 0,
+    YESNO = 1,
+    NONE = 2,
+    OK_CANCEL = 3,
+    WAIT = 5,
+    WAIT_CANCEL = 6,
+    YESNO_FOCUS_NO = 7,
+    OK_CANCEL_FOCUS_CANCEL = 8,
+    TWO_BUTTONS = 9,
+};
+
+enum class ProgressBarType : u32 {
+    PERCENTAGE = 0,
+    PERCENTAGE_CANCEL = 1,
+};
+
+enum class SystemMessageType : u32 {
+    TRC_EMPTY_STORE = 0,
+    TRC_PSN_CHAT_RESTRICTION = 1,
+    TRC_PSN_UGC_RESTRICTION = 2,
+    CAMERA_NOT_CONNECTED = 4,
+    WARNING_PROFILE_PICTURE_AND_NAME_NOT_SHARED = 5,
+};
+
+struct ButtonsParam {
+    const char* msg1{};
+    const char* msg2{};
+    std::array<char, 32> reserved{};
+};
+
+struct UserMessageParam {
+    ButtonType buttonType{};
+    s32 : 32;
+    const char* msg{};
+    ButtonsParam* buttonsParam{};
+    std::array<char, 24> reserved{};
+};
+
+struct ProgressBarParam {
+    ProgressBarType barType{};
+    s32 : 32;
+    const char* msg{};
+    std::array<char, 64> reserved{};
+};
+
+struct SystemMessageParam {
+    SystemMessageType sysMsgType{};
+    std::array<char, 32> reserved{};
+};
+
+struct Param {
+    CommonDialog::BaseParam baseParam;
+    std::size_t size;
+    MsgDialogMode mode;
+    s32 : 32;
+    UserMessageParam* userMsgParam;
+    ProgressBarParam* progBarParam;
+    SystemMessageParam* sysMsgParam;
+    OrbisUserServiceUserId userId;
+    std::array<char, 40> reserved;
+    s32 : 32;
+};
+
+struct MsgDialogResult {
+    FixedValue<u32, 0> mode{};
+    Result result{};
+    ButtonId buttonId{};
+    std::array<char, 32> reserved{};
+};
+
+class MsgDialogGui final : public ImGui::Layer {
+    const Param* param{};
+
+    void DrawUser(const UserMessageParam& user_message_param) {
+        const auto ws = ImGui::GetWindowSize();
+        ImGui::SetCursorPosY(ws.y / 2.0f - 30.0f);
+        ImGui::BeginGroup();
+        ImGui::PushTextWrapPos(ws.x - 30.0f);
+        ImGui::SetCursorPosX(
+            (ws.x - ImGui::CalcTextSize(user_message_param.msg, nullptr, false, ws.x - 40.0f).x) /
+            2.0f);
+        ImGui::Text("%s", user_message_param.msg);
+        ImGui::PopTextWrapPos();
+        ImGui::EndGroup();
+        switch (user_message_param.buttonType) {}
     }
-    return ORBIS_OK;
+
+    void DrawProgressBar(const ProgressBarParam& progress_bar_param) {}
+
+    void DrawSystemMessage(const SystemMessageParam& system_message_param) {}
+
+public:
+    void Draw() override {
+        const auto& io = ImGui::GetIO();
+
+        const ImVec2 window_size{
+            std::min(io.DisplaySize.x, 500.0f),
+            std::min(io.DisplaySize.y, 300.0f),
+        };
+
+        ImGui::CentralizeWindow();
+        ImGui::SetNextWindowSize(window_size);
+        ImGui::Begin("##Message Dialog", nullptr, ImGuiWindowFlags_NoDecoration);
+        switch (param->mode) {
+        case MsgDialogMode::USER_MSG:
+            DrawUser(*param->userMsgParam);
+            break;
+        case MsgDialogMode::PROGRESS_BAR:
+            DrawProgressBar(*param->progBarParam);
+            break;
+        case MsgDialogMode::SYSTEM_MSG:
+            DrawSystemMessage(*param->sysMsgParam);
+            break;
+        }
+        ImGui::End();
+    }
+
+    bool ShouldGrabGamepad() override {
+        return true;
+    }
+
+    explicit MsgDialogGui(const Param* param = nullptr) : param(param) {}
+} static g_msg_dialog_gui;
+
+static auto g_status = Status::NONE;
+static MsgDialogResult g_result{};
+
+Error PS4_SYSV_ABI sceMsgDialogClose() {
+    if (g_status != Status::RUNNING) {
+        return Error::NOT_RUNNING;
+    }
+    g_status = Status::FINISHED;
+    ImGui::Layer::RemoveLayer(&g_msg_dialog_gui);
+    return Error::OK;
+}
+
+Error PS4_SYSV_ABI sceMsgDialogGetResult(MsgDialogResult* result) {
+    if (g_status != Status::FINISHED) {
+        return Error::NOT_FINISHED;
+    }
+    if (result == nullptr) {
+        return Error::ARG_NULL;
+    }
+    for (const auto v : result->reserved) {
+        if (v != 0) {
+            return Error::PARAM_INVALID;
+        }
+    }
+    *result = g_result;
+    return Error::OK;
+}
+
+CommonDialog::Status PS4_SYSV_ABI sceMsgDialogGetStatus() {
+    return g_status;
+}
+
+Error PS4_SYSV_ABI sceMsgDialogInitialize() {
+    if (!CommonDialog::g_isInitialized) {
+        return Error::NOT_SYSTEM_INITIALIZED;
+    }
+    if (g_status != Status::NONE) {
+        return Error::ALREADY_INITIALIZED;
+    }
+    if (CommonDialog::g_isUsed) {
+        return Error::BUSY;
+    }
+    g_status = Status::INITIALIZED;
+    CommonDialog::g_isUsed = true;
+
+    return Error::OK;
+}
+
+Error PS4_SYSV_ABI sceMsgDialogOpen(const Param* param) {
+    if (g_status != Status::INITIALIZED && g_status != Status::FINISHED) {
+        return Error::INVALID_STATE;
+    }
+    ASSERT(param->size == sizeof(Param));
+    ASSERT(param->baseParam.size == sizeof(CommonDialog::BaseParam));
+    g_status = Status::RUNNING;
+    g_msg_dialog_gui = MsgDialogGui(param);
+    ImGui::Layer::AddLayer(&g_msg_dialog_gui);
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceMsgDialogProgressBarInc() {
@@ -66,14 +236,20 @@ int PS4_SYSV_ABI sceMsgDialogProgressBarSetValue() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceMsgDialogTerminate() {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceMsgDialogTerminate() {
+    if (g_status == Status::RUNNING) {
+        sceMsgDialogClose();
+    }
+    if (g_status == Status::NONE) {
+        return Error::NOT_INITIALIZED;
+    }
+    g_status = Status::NONE;
+    CommonDialog::g_isUsed = false;
+    return Error::OK;
 }
 
-int PS4_SYSV_ABI sceMsgDialogUpdateStatus() {
-    LOG_ERROR(Lib_MsgDlg, "(STUBBED) called");
-    return ORBIS_OK;
+Status PS4_SYSV_ABI sceMsgDialogUpdateStatus() {
+    return g_status;
 }
 
 void RegisterlibSceMsgDialog(Core::Loader::SymbolsResolver* sym) {
diff --git a/src/core/libraries/system/msgdialog.h b/src/core/libraries/system/msgdialog.h
index 28d379138..fbf525f75 100644
--- a/src/core/libraries/system/msgdialog.h
+++ b/src/core/libraries/system/msgdialog.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include "common/fixed_value.h"
 #include "common/types.h"
 #include "core/libraries/system/commondialog.h"
 
@@ -12,95 +13,19 @@ class SymbolsResolver;
 
 namespace Libraries::MsgDialog {
 
-using OrbisUserServiceUserId = s32;
+struct MsgDialogResult;
+struct Param;
 
-enum OrbisCommonDialogStatus {
-    ORBIS_COMMON_DIALOG_STATUS_NONE = 0,
-    ORBIS_COMMON_DIALOG_STATUS_INITIALIZED = 1,
-    ORBIS_COMMON_DIALOG_STATUS_RUNNING = 2,
-    ORBIS_COMMON_DIALOG_STATUS_FINISHED = 3
-};
-
-enum OrbisMsgDialogMode {
-    ORBIS_MSG_DIALOG_MODE_USER_MSG = 1,
-    ORBIS_MSG_DIALOG_MODE_PROGRESS_BAR = 2,
-    ORBIS_MSG_DIALOG_MODE_SYSTEM_MSG = 3,
-};
-
-enum OrbisMsgDialogButtonType {
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_OK = 0,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_YESNO = 1,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_NONE = 2,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_OK_CANCEL = 3,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_WAIT = 5,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_WAIT_CANCEL = 6,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_YESNO_FOCUS_NO = 7,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_OK_CANCEL_FOCUS_CANCEL = 8,
-    ORBIS_MSG_DIALOG_BUTTON_TYPE_2BUTTONS = 9,
-};
-
-enum OrbisMsgDialogProgressBarType {
-    ORBIS_MSG_DIALOG_PROGRESSBAR_TYPE_PERCENTAGE = 0,
-    ORBIS_MSG_DIALOG_PROGRESSBAR_TYPE_PERCENTAGE_CANCEL = 1,
-};
-
-enum OrbisMsgDialogSystemMessageType {
-    ORBIS_MSG_DIALOG_SYSMSG_TYPE_TRC_EMPTY_STORE = 0,
-    ORBIS_MSG_DIALOG_SYSMSG_TYPE_TRC_PSN_CHAT_RESTRICTION = 1,
-    ORBIS_MSG_DIALOG_SYSMSG_TYPE_TRC_PSN_UGC_RESTRICTION = 2,
-    ORBIS_MSG_DIALOG_SYSMSG_TYPE_CAMERA_NOT_CONNECTED = 4,
-    ORBIS_MSG_DIALOG_SYSMSG_TYPE_WARNING_PROFILE_PICTURE_AND_NAME_NOT_SHARED = 5,
-};
-
-struct OrbisMsgDialogButtonsParam {
-    const char* msg1;
-    const char* msg2;
-    char reserved[32];
-};
-
-struct OrbisMsgDialogUserMessageParam {
-    OrbisMsgDialogButtonType buttonType;
-    s32 : 32;
-    const char* msg;
-    OrbisMsgDialogButtonsParam* buttonsParam;
-    char reserved[24];
-};
-
-struct OrbisMsgDialogProgressBarParam {
-    OrbisMsgDialogProgressBarType barType;
-    int32_t : 32;
-    const char* msg;
-    char reserved[64];
-};
-
-struct OrbisMsgDialogSystemMessageParam {
-    OrbisMsgDialogSystemMessageType sysMsgType;
-    char reserved[32];
-};
-
-struct OrbisMsgDialogParam {
-    CommonDialog::OrbisCommonDialogBaseParam baseParam;
-    std::size_t size;
-    OrbisMsgDialogMode mode;
-    s32 : 32;
-    OrbisMsgDialogUserMessageParam* userMsgParam;
-    OrbisMsgDialogProgressBarParam* progBarParam;
-    OrbisMsgDialogSystemMessageParam* sysMsgParam;
-    OrbisUserServiceUserId userId;
-    char reserved[40];
-    s32 : 32;
-};
-
-int PS4_SYSV_ABI sceMsgDialogClose();
-int PS4_SYSV_ABI sceMsgDialogGetResult();
-int PS4_SYSV_ABI sceMsgDialogGetStatus();
-int PS4_SYSV_ABI sceMsgDialogInitialize();
-s32 PS4_SYSV_ABI sceMsgDialogOpen(const OrbisMsgDialogParam* param);
+CommonDialog::Error PS4_SYSV_ABI sceMsgDialogClose();
+CommonDialog::Error PS4_SYSV_ABI sceMsgDialogGetResult(MsgDialogResult* result);
+CommonDialog::Status PS4_SYSV_ABI sceMsgDialogGetStatus();
+CommonDialog::Error PS4_SYSV_ABI sceMsgDialogInitialize();
+CommonDialog::Error PS4_SYSV_ABI sceMsgDialogOpen(const Param* param);
 int PS4_SYSV_ABI sceMsgDialogProgressBarInc();
 int PS4_SYSV_ABI sceMsgDialogProgressBarSetMsg();
 int PS4_SYSV_ABI sceMsgDialogProgressBarSetValue();
-int PS4_SYSV_ABI sceMsgDialogTerminate();
-int PS4_SYSV_ABI sceMsgDialogUpdateStatus();
+CommonDialog::Error PS4_SYSV_ABI sceMsgDialogTerminate();
+CommonDialog::Status PS4_SYSV_ABI sceMsgDialogUpdateStatus();
 
 void RegisterlibSceMsgDialog(Core::Loader::SymbolsResolver* sym);
 } // namespace Libraries::MsgDialog
diff --git a/src/imgui/imgui_std.h b/src/imgui/imgui_std.h
new file mode 100644
index 000000000..5f577c036
--- /dev/null
+++ b/src/imgui/imgui_std.h
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <imgui.h>
+
+namespace ImGui {
+
+inline void CentralizeWindow() {
+    const auto display_size = GetIO().DisplaySize;
+    SetNextWindowPos(display_size / 2.0f, ImGuiCond_Always, {0.5f});
+}
+} // namespace ImGui