High school student Aya Tsukimori becomes cursed and is unable to leave her school dormitory. Meanwhile, many students begin reporting ghost sightings at the school, while others go missing and are later discovered to have drowned mysteriously. Soon, Aya attempts to communicate with fellow student Michi Kazato, who begins investigating the disappearances of her friends.

Utsumi and Seto's daily routine is to spend their afterschool hours just jabbering with one another along a riverbed. Getting excited over trivial word play, agonizing over the content of an email to be sent to a girl, and, at times, talking about a serious problem, the two endlessly engage in meaningless idle talk as if it were meaningful.