The Kito clan tosses Okarun and the gang into an alternate-reality version of Jiji's family home as an offering to the serpent god! There they encounter another of the clan's sacrifices, a child who goes on to possess the softhearted Jiji. The two of them become the Evil Eye, who then attacks Okarun and Momo. Okarun decides to take him on alone and sends Momo back aboveground to get help. There she comes up with an ingenious plan to get rid of the giant serpent god...but can she pull it off on her own in time to safe Jiji?

Okarun and Momo search for his precious family jewels, which he lost during his battle with Turbo Granny. Unfortunately, their classmate Aira has already found one, and it's awakened spiritual powers within her. Around this same time, a strange woman in a red dress appears at their school and attacks them! Who is she, and what's with her obsession with Aira? For mature audiences.

Momo Ayase strikes up an unusual friendship with her school's UFO fanatic, whom she nicknames "Okarun" because he has a name that is not to be said aloud. While Momo strongly believes in spirits, she thinks aliens are nothing but nonsense. Her new friend, however, thinks quite the opposite. To settle matters, the two set out to prove each other wrong-Momo to a UFO hotspot and Okarun to a haunted tunnel! What unfolds next is a beautiful story of young love...and oddly horny aliens and spirits? For mature audiences.