diff --git a/Common/MasterManager.cs b/Common/MasterManager.cs
index 29bc2a8..8051420 100644
--- a/Common/MasterManager.cs
+++ b/Common/MasterManager.cs
@@ -2,7 +2,9 @@
 
 public static class MasterManager
 {
-    public static double ReplyRate => 0.05;
+    public static float ReplyRate => 0.05f;
+    public static float ReplyMaxDelay => 2f;
+    public static float TypingMaxDelay => 1f;
 
     public static IReadOnlyList<(float rate, string message)> ReplyMessages => new List<(float rate, string message)>
     {
diff --git a/Common/RandomUtility.cs b/Common/RandomUtility.cs
new file mode 100644
index 0000000..60264d3
--- /dev/null
+++ b/Common/RandomUtility.cs
@@ -0,0 +1,16 @@
+namespace Approvers.King.Common;
+
+public static class RandomUtility
+{
+    private static readonly Random Random = new();
+
+    public static float GetRandomFloat(float max)
+    {
+        return GetRandomFloat(0f, max);
+    }
+
+    public static float GetRandomFloat(float min, float max)
+    {
+        return (float)(min + (max - min) * Random.NextDouble());
+    }
+}
\ No newline at end of file
diff --git a/DiscordEntry.cs b/DiscordEntry.cs
index 342d67f..b87efb7 100644
--- a/DiscordEntry.cs
+++ b/DiscordEntry.cs
@@ -17,6 +17,6 @@ private static async Task OnMessageReceived(SocketMessage message)
         if (message is not SocketUserMessage userMessage || userMessage.Author.IsBot) return;
 
         // 発言
-        await DiscordManager.ExecuteAsync<ReplyPresenter>(userMessage);
+        await DiscordManager.ExecuteAsync<RareReplyPresenter>(userMessage);
     }
 }
\ No newline at end of file
diff --git a/Events/RareReplyPresenter.cs b/Events/RareReplyPresenter.cs
new file mode 100644
index 0000000..b63350d
--- /dev/null
+++ b/Events/RareReplyPresenter.cs
@@ -0,0 +1,34 @@
+using Approvers.King.Common;
+using Discord;
+
+namespace Approvers.King.Events;
+
+public class RareReplyPresenter : DiscordMessagePresenterBase
+{
+    protected override async Task MainAsync()
+    {
+        if (RandomUtility.GetRandomFloat(1f) > MasterManager.ReplyRate) return;
+
+        await Task.Delay(TimeSpan.FromSeconds(RandomUtility.GetRandomFloat(MasterManager.ReplyMaxDelay)));
+        using (Message.Channel.EnterTypingState())
+        {
+            await Task.Delay(TimeSpan.FromSeconds(RandomUtility.GetRandomFloat(MasterManager.TypingMaxDelay)));
+            await Message.ReplyAsync(PickRandomMessage());
+        }
+    }
+
+    private static string PickRandomMessage()
+    {
+        var totalRate = MasterManager.ReplyMessages.Sum(x => x.rate);
+        var value = RandomUtility.GetRandomFloat(totalRate);
+
+        foreach (var (rate, message) in MasterManager.ReplyMessages)
+        {
+            if (value < rate) return message;
+
+            value -= rate;
+        }
+
+        return MasterManager.ReplyMessages[^1].message;
+    }
+}
\ No newline at end of file
diff --git a/Events/ReplyPresenter.cs b/Events/ReplyPresenter.cs
deleted file mode 100644
index a2dae3c..0000000
--- a/Events/ReplyPresenter.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-using Approvers.King.Common;
-using Discord;
-
-namespace Approvers.King.Events;
-
-public class ReplyPresenter : DiscordMessagePresenterBase
-{
-    private static readonly Random Random = new();
-
-    protected override async Task MainAsync()
-    {
-        var rand = Random.NextDouble();
-        Console.WriteLine($"rand: {rand}");
-        if (rand > MasterManager.ReplyRate) return;
-
-        await Message.ReplyAsync(PickRandomMessage());
-    }
-
-    private static string PickRandomMessage()
-    {
-        var totalRate = MasterManager.ReplyMessages.Sum(x => x.rate);
-        var value = Random.NextDouble() * totalRate;
-
-        foreach (var (rate, message) in MasterManager.ReplyMessages)
-        {
-            if (value < rate) return message;
-
-            value -= rate;
-        }
-
-        return MasterManager.ReplyMessages[^1].message;
-    }
-}
\ No newline at end of file