diff --git a/nico.py b/nico.py
index 419438a..cf48ee7 100644
--- a/nico.py
+++ b/nico.py
@@ -130,9 +130,6 @@ def get_kiriban_list (
     latest_fetched_at = cast (date, (VideoHistory
                                      .where ('fetched_at', '<=', base_date)
                                      .max ('fetched_at')))
-    previous_fetched_at = cast (date, (VideoHistory
-                                       .where ('fetched_at', '<', latest_fetched_at)
-                                       .max ('fetched_at')))
 
     for kiriban_views_count in KIRIBAN_VIEWS_COUNTS:
         targets = { vh.video.code for vh in (VideoHistory
@@ -143,7 +140,9 @@ def get_kiriban_list (
             if code in [kiriban[1]['contentId'] for kiriban in kiriban_list]:
                 continue
             previous_views_count = cast (int, (VideoHistory
-                                               .where ('code', code)
+                                               .where_has ('videos',
+                                                   lambda q: q.where (
+                                                       'code', code))
                                                .where ('fetched_at', '<', latest_fetched_at)
                                                .max ('views_count')))
             if previous_views_count >= kiriban_views_count: