The Tokyo Game Show 2018 demo of Yo-kai Watch 4 had a feature called Rare Events (レアイベント). The demo ended with a cutscene of Keita, Jibanyan, and Whisper entering the future through a mysterious door, but there's a rare alternate version of the cutscene shown with Fumi-chan instead of Keita. Ultimately, Rare Events did not make their way into the final release of the game, and it is unknown if they were intended just for the demo.