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 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.

Hanzawa's wife falls ill due to Erika's curse, and Mikado's conscience won't let him tell Hanzawa anything; Erika and Sakaki raid COOLEAN and interrogate Mikado.