diff --git a/konabot/plugins/fortune/random_text_record.py b/konabot/plugins/fortune/random_text_record.py
index 7739c20..ee3b385 100644
--- a/konabot/plugins/fortune/random_text_record.py
+++ b/konabot/plugins/fortune/random_text_record.py
@@ -1,10 +1,17 @@
 import base64
+import math
 import random
 import time
 
 from pathlib import Path
 
 
+def dec_func(t: float) -> float:
+    if t < 86400:
+        return 0.5 * (1 + math.tanh(t / 43200 - 1))
+    return math.exp(-0.00000043 * (t - 86400))
+
+
 class RandomTextManager:
     _cache: list[tuple[float, str]]
 
@@ -55,7 +62,8 @@ class RandomTextManager:
 
         for ts, cn in self._cache:
             contents.append(cn)
-            weights.append((abs(now - ts) + 0.01) ** (-1))
+            # weights.append((abs(now - ts) + 0.01) ** (-1))
+            weights.append(dec_func(now - ts))
 
         return random.choices(contents, weights)[0]