Okarun, a high school boy obsessed with supernatural phenomena, has lost his precious family jewels in a battle with Turbo Granny! His classmate Aira ends up finding one, and it awakens spiritual powers within her. Around this same time, a strange woman in a red dress appears at the school and attacks Aira, Okarun, and Momo! Who is she, and what’s with her obsession with Aira?

(Source: Viz Media)