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Momo is a high school girl born into a family of spirit mediums, and Okarun is her classmate and an occult fanatic. They start chatting after Momo saves Okarun from class bullies, but an argument arises between the two of them - Momo believes in ghosts but not in aliens, and Okarun believes in aliens but not in ghosts.

Okarun is cursed by Turbo Granny, and Momo uses her newly-awakened psychic powers to stop Turbo Granny from going out of control. Dawn breaks, and the two of them try to take temporary shelter in Momo's house, but their removal of a talisman from the torii gate in front of it comes back to haunt them when a giant alien called the Flatwoods Monster appears before them.

Turbo Granny's curse causes Okarun to transform, and he goes berserk, unable to control his powers. Momo's grandmother Seiko, a spirit medium, saves them in the nick of time. To lift the curse, Momo and Okarun decide to play tag with Turbo Granny. Before the duel, Seiko tells the pair to undergo some training, but that's exactly when Turbo Granny shows herself before Momo...

To settle the score with Turbo Granny, Momo and Okarun show up at the tunnel as they promised. They start the game of tag to pull the location-bound spirit away, and even manage to capture Turbo Granny using Momo's psychic powers. However, a giant crab-shaped location-bound spirit quickly approaches them, trying to take Turbo Granny back.

Victorious against Turbo Granny, Momo and Okarun can go back to their peaceful lives. The traumatic experiences have brought the two closer, but they find their relationship to be awkward. Just then, Okarun discloses something important to Momo. They supposedly defeated Turbo Granny, but for some reason Okarun's "thingie" hasn't returned...

Momo, Okarun, and Turbo Granny search for Okarun's missing golden balls. They search all over the school and find out that a pretty girl named Aira is in possession of one ball. Aira can now see "invisible things" - perhaps an effect of the ball? Then "Acrobatic Silky," a mysterious woman in a red dress, appears before Aira... and Momo and Okarun stand up for Aira when she's in trouble.

Momo and Okarun manage to pull Acrobatic Silky away from Aira after a fierce battle. However, Aira has already passed away because she was eaten by the yokai. Seeing Aira in such a state, Acrobatic Silky has a surprising idea...

The battle against Acrobatic Silky is over, and the three go back to normal school life. Aira starts to harbor romantic feelings stemming from how Okarun saved her. As Momo, Okarun, and Aira's feelings intertwine, the Serpoians show up again, trapping the three in a void.

Aira, having awakened Acrobatic Silky's powers within her, proceeds to have a back-and-forth battle against the Serpoians and the Dover Demon. Momo and Okarun also join the fray, and the battle intensifies. Then the aliens fuse together to compensate for their own weaknesses and attack the trio.

Momo, Okarun, and Aira make it through the aliens' assault by combining their powers. However, the Dover Demon that they thought they had defeated suddenly appears before them. It seems like he wants a rematch... but then he collapses, having used up all his strength. Unable to abandon him, the three take him back to Momo's house and treat his wounds.

Momo's childhood friend and first love Jiji appears and begins living in Momo's house. Momo is clearly hesitant about the sudden turn of events, but Jiji, plagued by apparitions in the house he moved into, has come to seek help from Seiko. Meanwhile, Okarun is clearly disturbed to learn that Jiji was Momo's first love and tries to distance himself from Momo.

Momo and Okarun head to Jiji's house, located in a hot spring town, to investigate what happened to Jiji's family. Along the way, Okarun feels sad seeing at how close Momo and Jiji are, but he is drawn to Jiji's good nature. Arriving at Jiji's house in a remote area of the mountains, they immediately enter the house, but there are several figures watching them as they do...