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 and Okarun’s ordeal with Turbo Granny has brought them closer, but things remain awkward between them. Okarun realizes he still has a problem.

Aira begins to develop a crush on Okarun. As the three friends' emotions intertwine, they suddenly face another extraterrestrial emergency.

Okarun and the girls try to clean up some misunderstandings with their classmates. Later, the aquatic creature reappears before Momo and Aira.

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.