On Monday, the official website of Shogakukan’s Big Comic Spirits magazine revealed that the television anime adaptation of Makoto Ojiro’s Insomniacs After School (Kimi wa Hokago Insomnia) manga will debut in Japan on Tokyo TV and other television networks in April 2023.
The anime’s main cast includes:
- Gen Sato (the voice of Chrome from Dr. Stone) as Ganta
- Konomi Tamura as Isaki

LIDEN FILMS’ Yuki Ikeda directs the anime, and Rintarou Ikeda (Science Fell in Love, So I Tried to Prove It, The Seven Deadly Sins: Imperial Wrath of The Gods) supervises and writes the series scripts. The characters are being designed by Yuki Fukuda (Plunderer). The music is composed by Yuki Hayashi (Haikyu!!, My Hero Academia, Gundam Build Fighters).
In May 2019, Ojiro published the manga in Shogakukan’s Big Comic Spirits magazine. On January 12, Shogakukan will release the manga’s 11th collected book volume.
Viz Media has licensed the manga in English, and the first compiled book volume will be released on March 21. The following is how the company describes the story:
Two sleepless teenagers find kinship as they escape to their school’s astronomy observatory.
Unable to sleep at night, Ganta Nakami is cranky in class and unpopular with his classmates. He discovers that the school observatory, once used by the now-defunct astronomy club, may be the perfect place for a nap—but he’s not alone. Fellow insomniac Isaki Magari is willing to share the observatory with Nakami, and a friendship between the two begins as they bond over the most unlikely of things.
Dark rumors about what befell the members of the astronomy club keep people away from the school observatory, and that’s what makes it the perfect sanctuary for Nakami and Magari to get some much-needed rest. Unfortunately, the school faculty can’t allow its unsanctioned use. But if there were a new astronomy club, maybe these two insomniacs could have a place to call home!
The manga also inspired a live-action feature, which will debut in 2023. In 2019, the music video for rock band Macaroni Enpitsu’s “Enshin” (Centrifuge) song used comic graphics.
Watch the Insomniacs After School trailer below: