Error: Feed failed! Causes may be (1) No data found for RSS feed https://www.linegames.org/ja/Grim-Tales-codes/253752978832/; (2) There are no items are available for this feed; (3) The RSS feed does not validate.
Please verify that the URL https://www.linegames.org/ja/Grim-Tales-codes/253752978832/ works first in your browser and that the feed passes a validator test.