The Night Beyond the Tricornered Window

is a Japanese manga series written and illustrated by Tomoko Yamashita. It was serialized in the monthly yaoi manga magazine Magazine Be × Boy from March 7, 2013 to December 7, 2020. It was compiled into 10 tankōbon volumes published by Libre. A live-action film adaptation was released on January 22, 2021. An anime television series adaptation by Zero-G premiered on October 3, 2021 and ran for 12 episodes to December 19, 2021.

Plot
Kousuke Mikado has been able to see spirits for as long as he can remember. Extremely terrified of them, he tries to suppress his ability by wearing glasses. One day, while working at a bookstore, he catches the attention of Rihito Hiyakawa, an eccentric medium who is convinced that they were destined to meet each other.

Thanks to Hiyakawa's antics, Mikado is thrust into the world of the paranormal, with the former promising that he will shed his fears, if Mikado stays with him. As they continue to work together, the two discover a series of malicious curses that all point to the same name &mdash; "Erika Hiura." What is this person's goal, and how do they connect with Mikado and Hiyakawa?

Official

 * Official anime website (in Japanese)

Other Wikis

 * Manga
 * Anime
 * Anime
 * Anime