Momo believes in ghosts. Okarun believes in aliens. To make each other believe what they deny, they head to a spot famous for UFO sightings and a spiritual hotspot.

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.

Okarun and Momo arrive at the tunnel to confront Turbo Granny. Just when they think they've won, a giant crab spirit crashes through the wall.

Turbo Granny reveals that Okarun's missing organs are contained within golden spheres. Aira, who has found one, now has the ability to see spirits.

Momo and Okarun manage to weaken Acrobatic Silky but make a shocking discovery regarding Aira. Acrobatic Silky suggests a surprising way to help.

The battle against Acrobatic Silky is over, Aira harbors romantic feelings stemming from how Okarun had saved her. As Momo, Okarun, and Aira's feelings intertwine, Serpoians make another appearance, and the three of them are trapped in void space.