The Night Beyond the Tricornered Window

Mikado Kousuke possesses a peculiar ability to see eerie things; one day, Hiyakawa Rihito appears in the shop where Mikado works; when Hiyakawa discovers that Mikado can see spirits, he forces Mikado to help with an exorcism.

Mikado, now working for Hiyakawa's property appraisal and speciality cleaning company, COOLEAN, is asked by a coworker to investigate a suspicious fortune-teller; when Hiyakawa and Mikado meet the fortune-teller, they find that he also possesses of unique abilities.

Mikado and Hiyakawa go to investigate a pond; their client, the woman who owns the property, has the same dream every night of a corpse floating in the pond; Erika reveals that she is a curse peddler and a necromancer.

At the request of police detective Hanzawa, Mikado visits an empty storefront where paranormal disappearances are often reported; when Mikado phones Hiyakawa, who is back at the office, Hiyakawa possesses Mikado's body and begins investigating.

Hiyakawa can't understand what Mikado is feeling; while Mikado recognizes how deviant Hiyakawa is, he just can't cut ties with him; Mikado is taken by Sakaki and brought to Erika in a car; Erika asks the bewildered Mikado for help with her homework.

While visiting a member of a bereaved family, Hanzawa remembers the first time he met Hiyakawa over a decade ago; when his mother discovered his abilities, Hiyakawa had been placed in a symbolic position within a special group.