diff --git a/app/src/main/java/com/aqua_ix/youbimiku/MainActivity.kt b/app/src/main/java/com/aqua_ix/youbimiku/MainActivity.kt
index 43babba..5c3a144 100644
--- a/app/src/main/java/com/aqua_ix/youbimiku/MainActivity.kt
+++ b/app/src/main/java/com/aqua_ix/youbimiku/MainActivity.kt
@@ -7,8 +7,12 @@ import android.graphics.BitmapFactory
 import android.net.Uri
 import android.os.Bundle
 import android.util.Log
-import android.view.*
-import android.view.ViewGroup.LayoutParams.*
+import android.view.Gravity
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewGroup
+import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
 import android.widget.FrameLayout
 import android.widget.Toast
 import androidx.appcompat.app.AlertDialog
@@ -21,9 +25,28 @@ import com.aallam.openai.api.core.FinishReason
 import com.aallam.openai.api.model.ModelId
 import com.aallam.openai.client.OpenAI
 import com.aallam.openai.client.OpenAIConfig
-import com.aqua_ix.youbimiku.BuildConfig.*
-import com.aqua_ix.youbimiku.config.*
-import com.aqua_ix.youbimiku.database.*
+import com.aqua_ix.youbimiku.BuildConfig.BUILD_TYPE
+import com.aqua_ix.youbimiku.BuildConfig.FLAVOR
+import com.aqua_ix.youbimiku.BuildConfig.IMOBILE_BANNER_SID
+import com.aqua_ix.youbimiku.BuildConfig.IMOBILE_INTERSTITIAL_SID
+import com.aqua_ix.youbimiku.BuildConfig.IMOBILE_MID
+import com.aqua_ix.youbimiku.BuildConfig.IMOBILE_PID
+import com.aqua_ix.youbimiku.BuildConfig.IRONSOURCE_APP_KEY
+import com.aqua_ix.youbimiku.config.AIModelConfig
+import com.aqua_ix.youbimiku.config.FontSizeConfig
+import com.aqua_ix.youbimiku.config.Key
+import com.aqua_ix.youbimiku.config.LanguageConfig
+import com.aqua_ix.youbimiku.config.SharedPreferenceManager
+import com.aqua_ix.youbimiku.config.getAIModel
+import com.aqua_ix.youbimiku.config.getFontSizeType
+import com.aqua_ix.youbimiku.config.getLanguage
+import com.aqua_ix.youbimiku.config.getOpenAIRequestCount
+import com.aqua_ix.youbimiku.config.setAIModel
+import com.aqua_ix.youbimiku.config.setFontSize
+import com.aqua_ix.youbimiku.config.setOpenAIRequestCount
+import com.aqua_ix.youbimiku.database.AppDatabase
+import com.aqua_ix.youbimiku.database.entityToMessage
+import com.aqua_ix.youbimiku.database.messageToEntity
 import com.aqua_ix.youbimiku.databinding.ActivityMainBinding
 import com.github.bassaer.chatmessageview.model.Message
 import com.google.android.play.core.review.ReviewManagerFactory
@@ -35,7 +58,9 @@ import com.google.firebase.ktx.Firebase
 import com.google.firebase.remoteconfig.FirebaseRemoteConfig
 import com.google.firebase.remoteconfig.ktx.remoteConfig
 import com.google.firebase.remoteconfig.ktx.remoteConfigSettings
-import com.ironsource.mediationsdk.*
+import com.ironsource.mediationsdk.ISBannerSize
+import com.ironsource.mediationsdk.IronSource
+import com.ironsource.mediationsdk.IronSourceBannerLayout
 import com.ironsource.mediationsdk.adunit.adapter.utility.AdInfo
 import com.ironsource.mediationsdk.integration.IntegrationHelper
 import com.ironsource.mediationsdk.logger.IronSourceError
@@ -44,7 +69,15 @@ import com.ironsource.mediationsdk.sdk.LevelPlayInterstitialListener
 import jp.co.imobile.sdkads.android.FailNotificationReason
 import jp.co.imobile.sdkads.android.ImobileSdkAd
 import jp.co.imobile.sdkads.android.ImobileSdkAdListener
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 
 
 class MainActivity : AppCompatActivity(), View.OnClickListener, DialogListener {
@@ -134,20 +167,37 @@ class MainActivity : AppCompatActivity(), View.OnClickListener, DialogListener {
         binding.chatView.setDateSeparatorFontSize(0F)
         binding.chatView.setInputTextHint(getString(R.string.input_text_hint))
         binding.chatView.setOnClickSendButtonListener(this)
-        binding.chatView.setOnBubbleLongClickListener(object : Message.OnBubbleLongClickListener {
-            override fun onLongClick(message: Message) {
-                showActionSheet(message)
-            }
-        })
         binding.chatView.setMessageMaxWidth(640)
+
+        CoroutineScope(Dispatchers.Main).launch {
+            delay(500)
+            binding.chatView.setOnBubbleLongClickListener(object :
+                Message.OnBubbleLongClickListener {
+                override fun onLongClick(message: Message) {
+                    Log.d(TAG, "onLongClick: ${message.text}")
+                    showActionSheet(message)
+                }
+            })
+        }
     }
 
     private fun showActionSheet(message: Message) {
-        val options = arrayOf(getString(R.string.copy_message))
+        val options = arrayOf(
+            getString(R.string.copy_message),
+            getString(R.string.report_message)
+        )
         AlertDialog.Builder(this)
             .setItems(options) { _, which ->
                 when (which) {
                     0 -> message.text?.let { copyMessageToClipboard(it) }
+                    1 -> message.text?.let {
+                        ReportUtil.showReportReasonDialog(
+                            this,
+                            it,
+                            userAccount.getName() ?: "",
+                            scope
+                        )
+                    }
                 }
             }
             .show()
diff --git a/app/src/main/java/com/aqua_ix/youbimiku/ReportUtil.kt b/app/src/main/java/com/aqua_ix/youbimiku/ReportUtil.kt
new file mode 100644
index 0000000..03bab0c
--- /dev/null
+++ b/app/src/main/java/com/aqua_ix/youbimiku/ReportUtil.kt
@@ -0,0 +1,93 @@
+package com.aqua_ix.youbimiku
+
+import android.content.Context
+import android.widget.EditText
+import android.widget.Toast
+import androidx.appcompat.app.AlertDialog
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.net.HttpURLConnection
+import java.net.URL
+
+object ReportUtil {
+
+    fun showReportReasonDialog(
+        context: Context,
+        text: String,
+        userName: String,
+        scope: CoroutineScope
+    ) {
+        val editText = EditText(context).apply {
+            hint = context.getString(R.string.report_message_reason)
+            setPadding(64, 32, 64, 32)
+        }
+
+        AlertDialog.Builder(context)
+            .setTitle(context.getString(R.string.report_message))
+            .setView(editText)
+            .setPositiveButton(context.getString(R.string.report_message_send)) { _, _ -> }
+            .setNegativeButton(context.getString(R.string.report_message_cancel), null)
+            .create().apply {
+                show()
+                getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener {
+                    val reason = editText.text.toString()
+                    if (reason.isNotBlank()) {
+                        reportMessage(context, userName, text, reason, scope)
+                        dismiss()
+                    } else {
+                        editText.error = context.getString(R.string.report_message_reason_required)
+                    }
+                }
+            }
+    }
+
+    private fun reportMessage(
+        context: Context,
+        userName: String,
+        text: String,
+        reason: String,
+        scope: CoroutineScope
+    ) {
+        scope.launch {
+            try {
+                val url = URL(BuildConfig.REPORT_END_POINT)
+                val urlConnection = url.openConnection() as HttpURLConnection
+                urlConnection.setRequestProperty("Content-Type", "application/json")
+                urlConnection.doOutput = true
+
+                val data =
+                    """{"timestamp": "${System.currentTimeMillis()}", "userName": "$userName", "text": "$text", "reason": "$reason"}"""
+                urlConnection.outputStream.use { it.write(data.toByteArray()) }
+
+                val responseCode = urlConnection.responseCode
+                if (responseCode == HttpURLConnection.HTTP_OK) {
+                    withContext(Dispatchers.Main) {
+                        Toast.makeText(
+                            context,
+                            context.getString(R.string.message_reported),
+                            Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                } else {
+                    withContext(Dispatchers.Main) {
+                        Toast.makeText(
+                            context,
+                            context.getString(R.string.message_reported_error),
+                            Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                }
+            } catch (ex: Exception) {
+                withContext(Dispatchers.Main) {
+                    Toast.makeText(
+                        context,
+                        context.getString(R.string.message_reported_error),
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 808b4a3..c9062da 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -47,4 +47,11 @@
 
     <string name="copy_message">コピー</string>
     <string name="message_copied">コピーしました</string>
+    <string name="report_message">問題を報告</string>
+    <string name="report_message_reason">理由</string>
+    <string name="report_message_reason_required">理由を入力してください</string>
+    <string name="report_message_send">送信</string>
+    <string name="report_message_cancel">キャンセル</string>
+    <string name="message_reported">問題を報告しました</string>
+    <string name="message_reported_error">報告に失敗しました</string>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 31cbf34..b80a49a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -35,7 +35,7 @@
 
     <string name="clear_message_history">Clear Chat History</string>
 
-    <string name="official_account">Twitter Account</string>
+    <string name="official_account">Official Account</string>
     <string name="official_account_error">App not found</string>
 
     <string name="setting_submit_review">Submit Review</string>
@@ -48,4 +48,11 @@
 
     <string name="copy_message">Copy</string>
     <string name="message_copied">Copied</string>
+    <string name="report_message">Report</string>
+    <string name="report_message_reason">Reason</string>
+    <string name="report_message_reason_required">Please enter a reason</string>
+    <string name="report_message_send">Send</string>
+    <string name="report_message_cancel">Cancel</string>
+    <string name="message_reported">Reported</string>
+    <string name="message_reported_error">Report failed</string>
 </resources>