Keita has not got a costume ready for the Halloween Parade, and while Kuma, Kanchi, and Fumi wait for him, he discovers his mother has become something like a vampire. Keita soon discovers that the Yo-Kai Gabunyan is to blame, and has turned the whole town into other Gabunyan. Keita gets Kuma, Kanchi, and Fumi, who have not been bitten, to help him stop Gabunyan, revealing to them that Yo-Kai exist.
萬聖節來臨,妖怪亦混雜在人類之中一同作樂。景太與文花等人相約一起去看巡遊,臨行前小睡一覺,醒後卻驚見其他人都變成妖怪吸血喵。為挽救全人類吸血喵化的危機,景太一行人決意尋找材料製造疫苗。