Momo awakens psychic powers, while Okarun is cursed by Turbo Granny. They evacuate to Momo's house, but a giant alien appears before them.

After Momo's grandmother temporarily suppresses the evil spirit within Okarun, she says that a game of tag may be the key to defeating it for good.

Momo's childhood friend Jiji has come to stay with the Ayases. He explains that he needs Seiko’s help with some strange phenomena at his house.

As Momo fends off an attack in the outdoor hot spring, Okarun and Jiji panic over how to handle the mysterious room. Just then, the doorbell rings.