# The Night Beyond the Tricornered Window

The Night Beyond the Tricornered Window (Japanese: さんかく窓の外側は夜, Hepburn: Sankaku Mado no Sotogawa wa Yoru) is a Japanese manga series written and illustrated by Tomoko Yamashita. It was serialized in the monthly boys' love manga magazine Magazine Be × Boy from March 7, 2013, to December 7, 2020. A live-action film adaptation was released on January 22, 2021, and an anime television series adaptation by Zero-G aired from October to December 2021.

## Plot

Kosuke Mikado, a bookstore clerk, is able to see ghosts since he was young, which terrifies him. One day, he meets Rihito Hiyakawa, a fearless exorcist who lacks social boundaries. Hiyakawa is able to see and exorcise ghosts by entering Mikado's body and requests him to become his assistant. As the two work closely together, they learn that the supernatural incidents are closely tied with a high school student named Erika Hiura, who works as a mercenary necromancer to cast curses on other people. As Mikado and Hiyakawa investigate, Mikado begins realizing that Hiyakawa is hiding a secret.

## Characters
### Kosuke Mikado (三角 康介, Mikado Kōsuke)

    Voiced by: Haruki Ishiya (drama CD), Nobunaga Shimazaki (anime)
    Played by: Jun Shison

### Rihito Hiyakawa (冷川 理人, Hiyakawa Rihito)

    Voiced by: Taito Ban (drama CD), Wataru Hatano (anime)
    Played by: Masaki Okada

### Erika Hiura (非浦 英莉可, Hiura Erika)

    Voiced by: Chika Anzai (anime)
    Played by: Yurina Hirate

### Keita Mukae (迎 系多, Mukae Keita)

    Voiced by: Soma Saito (anime)

### Hiroki Hanzawa (半澤 日路輝, Hanzawa Hiroki)

    Voiced by: Satoshi Mikami (anime)
    Portrayed by: Kenichi Takita

### Kazuomi Sakaki (逆木 一臣, Sakaki Kazuomi)

    Voiced by: Junichi Suwabe (anime)
    Portrayed by: Shinya Niiro

## Development

In 2021, Yamashita stated that she initially wrote The Night Beyond the Tricornered Window as a short story before it became serialized. Yamashita also affirmed that while she did see feedback from others that Hiyakawa and Mikado could be considered a reversible pairing, she intended for Hiyakawa to be the top in their relationship. In addition, she stated that she focuses on the surrounding environment and characters besides the main couple. Yamashita also said that she wanted to include heterosexual romance in her boys' love works and she was surprised that she received positive feedback on chapters that focused on Erika and Sasaki's romance, as well as Mikado's parents, despite the story being serialized in a boys' love magazine. She claimed that she initially wrote Erika and Mukae as characters who would lure Hiyakawa and Mikado into temptation, but she changed her mind after realizing how "sad" it would be if her characters had an "unhappy" role. Yamashita also stated that she includes diversity into her works, such as including female police officers with male police officers.

## Media
### Manga

The Night Beyond the Tricornered Window is written and illustrated by Tomoko Yamashita. It is her longest work to date. It was serialized in the monthly boys' love manga magazine Magazine Be × Boy from March 7, 2013, in the April 2013 issue to December 7, 2020, in the January 2021 issue. The chapters were later released in eight bound volumes by Libre under the Kurofune Comics imprint. Volume 2 was sold with a bonus illustration card with purchase through Amazon.
In September 2014, Viz Media announced at Yaoi-Con that they licensed the series for North American distribution in English under their SuBLime imprint, releasing it in digital format.
| No. | Original release date | Original ISBN | English release date | English ISBN |
| 1 | February 10, 2014 (2014-02-10) | 978-4-7997-1436-2 | March 24, 2015 (2015-03-24) | 978-1-4215-8219-1 |
| 2 | February 10, 2015 (2015-02-10) | 978-4-7997-2487-3 | November 24, 2015 (2015-11-24) | 978-1-4215-8649-6 |
| 3 | March 10, 2016 (2016-03-10) | 978-4-7997-2894-9 | November 22, 2016 (2016-11-22) | 978-1-4215-9549-8 |
| 4 | December 10, 2016 (2016-12-10) | 978-4-7997-3163-5 | December 26, 2017 (2017-12-26) | 978-1-9747-0129-2 |
| 5 | August 10, 2017 (2017-08-10) | 978-4-7997-3436-0 | August 24, 2018 (2018-08-24) | 978-1-9747-0560-3 |
| 6 | July 10, 2018 (2018-07-10) | 978-4-7997-3924-2 | October 22, 2019 (2019-10-22) | 978-1-9747-1429-2 |
| 7 | April 10, 2019 (2019-04-10) | 978-4-7997-4285-3 | October 27, 2020 (2020-10-27) | 978-1-9747-2335-5 |
| 8 | February 10, 2020 (2020-02-10) | 978-4-7997-4285-3 | July 27, 2021 (2021-07-27) | 978-1-9747-2593-9 |
| 9 | September 10, 2020 (2020-09-10) | 978-4-7997-4921-0 | October 26, 2021 (2021-10-26) | 978-1-9747-2733-9 |
| 10 | March 10, 2021 (2021-03-10) | 978-4-7997-5166-4 | March 22, 2022 (2022-03-22) | 978-1-9747-3177-0 |

### Drama CD

An audio drama CD adaptation was released on April 10, 2019, with the release of volume 7 in Japan, starring Haruki Ishiya as Kosuke Mikado and Taito Ban as Rihito Hiyakawa. A second drama CD was released on February 10, 2020, with the release of volume 8, featuring an original story.

### Film

A live-action film adaptation was announced in January 2020, starring Jun Shison as Kosuke Mikado, Masaki Okada as Rihito Hiyakawa, and Yurina Hirate as Erika Hiura. The film is directed by Yukihiro Morigaki and written by Tomoko Aizawa. The release date was originally announced as October 30, 2020, but it was delayed to January 22, 2021, due to the COVID-19 pandemic. Yuki Sakurai, Kenichi Takita, Emi Wakui, Makita Sports, Michitaka Tsutsui, and Shinya Niiro were announced as additional cast members in March 2020. Keiko Kitagawa also appears in a minor role in the film as a lawyer. The film's theme song is "Darken" by Zutomayo, and their song "Hypersomnia" is also featured in the film. The soundtrack is composed by Yuma Yamaguchi.

### Anime

An anime television series adaptation of The Night Beyond the Tricornered Window was announced in the January 2021 issue of Magazine Be × Boy, published on December 7, 2020. The anime is produced by Zero-G and is directed by Yoshitaka Yasuda, who will also be in charge of character design. Daiji Iwanaga is the chief director for the series, with Ayumi Sekine in charge of the series' scripts, and Evan Call composing the series' music. It aired from October 3 to December 19, 2021, on Tokyo MX, SUN, and BS Fuji. Frederic performed the opening theme "Saika", while Wataru Hatano performed the ending theme "Breakers". Crunchyroll streamed the series.

#### Episode list

| No. | Title | Directed by | Written by | Storyboarded by | Original release date |
| 1 | "Encounter" Transliteration: "Deai" (Japanese: 出逢) | Daiji Iwanaga | Ayumi Sekine | Daiji Iwanaga | October 3, 2021 (2021-10-03) |
| 2 | "Binding" Transliteration: "Sokubaku" (Japanese: 束縛) | Masaki Utsunomiya | Katsuhiko Takayama | Miyana Okita | October 10, 2021 (2021-10-10) |
| 3 | "Malediction" Transliteration: "Juso" (Japanese: 呪詛) | Tōru Kitahata | Tomoko Konparu | Yoshitaka Yasuda | October 17, 2021 (2021-10-17) |
| 4 | "Pitfall" Transliteration: "Kansei" (Japanese: 陥穽) | Tomoya Takayama | Katsuhiko Takayama | Tatsuya Abe | October 24, 2021 (2021-10-24) |
| 5 | "Past" Transliteration: "Kako" (Japanese: 過去) | Daiji Iwanaga | Tomoko Konparu | Miyana Okita | October 31, 2021 (2021-10-31) |
| 6 | "(dis)belief" Transliteration: "Shingi" (Japanese: 信疑) | Kaoru Suzuki | Ayumi Sekine | Yōichi Ueda | November 7, 2021 (2021-11-07) |
| 7 | "Atonement" Transliteration: "Shokuzai" (Japanese: 贖罪) | Fumihiro Matsui | Katsuhiko Takayama | Katsuyuki Kodera | November 14, 2021 (2021-11-14) |
| 8 | "Loneliness" Transliteration: "Kodoku" (Japanese: 孤独) | Masahiro Takata | Tomoko Konparu | Katsuyuki Kodera | November 21, 2021 (2021-11-21) |
| 9 | "Confluence" Transliteration: "Kōsaku" (Japanese: 交錯) | Akiko Nakano | Katsuhiko Takayama | Kiyoko Sayama | November 28, 2021 (2021-11-28) |
| 10 | "Resolve" Transliteration: "Kakugo" (Japanese: 覚悟) | Tatsuya Abe | Tomoko Konparu | Tatsuya Abe | December 5, 2021 (2021-12-05) |
| 11 | "Confrontation" Transliteration: "Taiji" (Japanese: 対峙) | Daiji Iwanaga | Ayumi Sekine | Miyana Okita | December 12, 2021 (2021-12-12) |
| 12 | "Destiny" Transliteration: "Unmei" (Japanese: 運命) | Kaoru Suzuki | Ayumi Sekine | Yōichi Ueda | December 19, 2021 (2021-12-19) |

## Reception

The Night Beyond the Tricornered Window has sold a cumulative total of 1 million physical copies in Japan by January 2020. Volume 1 peaked at No. 14 on Oricon and sold a total of 24,718 physical copies on its first week of sales. Volume 2 peaked at No. 16 on Oricon and sold a total of 27,201 physical copies on its first week of sales. Volume 3 peaked at No. 36 on Oricon and sold a total of 22,680 physical copies on its first week of sales. Volume 4 sold a cumulative total of 30,196 physical copies on its first two weeks of sales. Volume 5 peaked at No. 48 on Oricon and sold a total of 17,710 physical copies on its first week of sales. Volume 6 peaked at No. 48 on Oricon and sold a total of 19,918 physical copies on its first week of sales.
Rebecca Silverman from Anime News Network cites the horror and mystery plot as the series' greatest strength and that the lesser focus on romance may make it easier for readers who are not interested in boys' love. However, she also claims the romance has creepy undertones.
For the live-action film, Mark Schilling from The Japan Times gave it 3 out of 5 stars, describing it "absurd" but praising Hirate's acting.