Insomniacs After School

Insomniacs After School (君は放課後インソムニア) is a Japanese manga series written and illustrated by Makoto Ojiro. It was serialized in Shogakukan's manga magazine Weekly Big Comic Spirits from May 2019 to August 2023. An anime television series adaptation produced by Liden Films aired from April to July 2023. A live-action film adaptation premiered in June 2023.

Plot
In the small city of Nanao, insomniac Ganta Nakami tries to catch a nap in his school's abandoned astronomical observatory. There he stumbles upon a sociable and carefree girl named Isaki Magari who has the same problem. The two form an awkward friendship and reestablish their school's defunct astronomy club.

Characters

 * Ganta Nakami (中見 丸太)
 * A high school student of Kuyo High School who suffers from insomnia. He comes off as grumpy and unfriendly due to his condition. However, after meeting Isaki, he opens up to the people around him and reveals to Isaki that the cause of his insomnia is due to separation anxiety caused by his mother leaving him and his father. Ganta is determined to protect the observatory and the revived Astronomy Club, of which he is the president. He becomes Isaki's boyfriend at the end of the club trip during the summer holiday of their first year. He aims to get into a university with a nursing program in Kanazawa, Ishikawa, inspired by his desire to always be at Isaki's side.
 * A high school student of Kuyo High School who suffers from insomnia. He comes off as grumpy and unfriendly due to his condition. However, after meeting Isaki, he opens up to the people around him and reveals to Isaki that the cause of his insomnia is due to separation anxiety caused by his mother leaving him and his father. Ganta is determined to protect the observatory and the revived Astronomy Club, of which he is the president. He becomes Isaki's boyfriend at the end of the club trip during the summer holiday of their first year. He aims to get into a university with a nursing program in Kanazawa, Ishikawa, inspired by his desire to always be at Isaki's side.
 * A high school student of Kuyo High School who suffers from insomnia. He comes off as grumpy and unfriendly due to his condition. However, after meeting Isaki, he opens up to the people around him and reveals to Isaki that the cause of his insomnia is due to separation anxiety caused by his mother leaving him and his father. Ganta is determined to protect the observatory and the revived Astronomy Club, of which he is the president. He becomes Isaki's boyfriend at the end of the club trip during the summer holiday of their first year. He aims to get into a university with a nursing program in Kanazawa, Ishikawa, inspired by his desire to always be at Isaki's side.


 * Isaki Magari (曲 伊咲)
 * A cheerful high school girl who also suffers from insomnia like Ganta. She first discovered the abandoned observatory and made it her sleeping haven, until Ganta came along. As she and Ganta became closer, she shared to him that she is suffering a defective heart condition since birth which requires monthly examinations, frequent hospitalization, and even surgeries. She was the only other member of the Astronomy Club in her first year, and became the vice-president later in the winter of the same year. She started dating Ganta after his confession at the end of their club trip. Initially, she aimed for a university within Ishikawa Prefecture, until she managed to convinced her mother to allow her to try for a university in Osaka. Although never mentioned in the manga, it is confirmed by the author, that Magari has Hypoplastic left heart syndrome.
 * A cheerful high school girl who also suffers from insomnia like Ganta. She first discovered the abandoned observatory and made it her sleeping haven, until Ganta came along. As she and Ganta became closer, she shared to him that she is suffering a defective heart condition since birth which requires monthly examinations, frequent hospitalization, and even surgeries. She was the only other member of the Astronomy Club in her first year, and became the vice-president later in the winter of the same year. She started dating Ganta after his confession at the end of their club trip. Initially, she aimed for a university within Ishikawa Prefecture, until she managed to convinced her mother to allow her to try for a university in Osaka. Although never mentioned in the manga, it is confirmed by the author, that Magari has Hypoplastic left heart syndrome.
 * A cheerful high school girl who also suffers from insomnia like Ganta. She first discovered the abandoned observatory and made it her sleeping haven, until Ganta came along. As she and Ganta became closer, she shared to him that she is suffering a defective heart condition since birth which requires monthly examinations, frequent hospitalization, and even surgeries. She was the only other member of the Astronomy Club in her first year, and became the vice-president later in the winter of the same year. She started dating Ganta after his confession at the end of their club trip. Initially, she aimed for a university within Ishikawa Prefecture, until she managed to convinced her mother to allow her to try for a university in Osaka. Although never mentioned in the manga, it is confirmed by the author, that Magari has Hypoplastic left heart syndrome.


 * Yui Shiromaru (白丸 結)
 * An alumna of the Astronomy Club who runs an arcade near Wakuraonsen Station. She taught Ganta the basics of astrophotography and often acts as the unofficial advisor of the club. She had a crush on a classmate but did not confess to him. Yui lives in a container house next to the arcade and owns a cat named Rollo.
 * An alumna of the Astronomy Club who runs an arcade near Wakuraonsen Station. She taught Ganta the basics of astrophotography and often acts as the unofficial advisor of the club. She had a crush on a classmate but did not confess to him. Yui lives in a container house next to the arcade and owns a cat named Rollo.
 * An alumna of the Astronomy Club who runs an arcade near Wakuraonsen Station. She taught Ganta the basics of astrophotography and often acts as the unofficial advisor of the club. She had a crush on a classmate but did not confess to him. Yui lives in a container house next to the arcade and owns a cat named Rollo.


 * Tao Ukegawa (受川 太鳳)
 * Ganta's childhood friend and a member of the Student Council. He is composed and usually gives good advice to Ganta whenever the latter feels down.
 * Ganta's childhood friend and a member of the Student Council. He is composed and usually gives good advice to Ganta whenever the latter feels down.
 * Ganta's childhood friend and a member of the Student Council. He is composed and usually gives good advice to Ganta whenever the latter feels down.


 * Motoko Kanikawa (蟹川 モトコ)
 * Isaki's friend and the daughter of the owners of an okonomiyaki restaurant. Nicknamed "Motoko Princess" and "Kani", she is perceived as selfish and attention-seeking but is also caring of her family and friends. Motoko has a rivalry with Ganta.
 * Isaki's friend and the daughter of the owners of an okonomiyaki restaurant. Nicknamed "Motoko Princess" and "Kani", she is perceived as selfish and attention-seeking but is also caring of her family and friends. Motoko has a rivalry with Ganta.
 * Isaki's friend and the daughter of the owners of an okonomiyaki restaurant. Nicknamed "Motoko Princess" and "Kani", she is perceived as selfish and attention-seeking but is also caring of her family and friends. Motoko has a rivalry with Ganta.


 * Kanami Anamizu (穴水 かなみ)
 * Isaki's athletic friend who is in the softball club. She has a crush on Hira-senpai of the baseball club. Kanami is often depicted as a strong tomboy but also has a cute side to her: hates ghost stories, likes sweets and love talk.
 * Isaki's athletic friend who is in the softball club. She has a crush on Hira-senpai of the baseball club. Kanami is often depicted as a strong tomboy but also has a cute side to her: hates ghost stories, likes sweets and love talk.
 * Isaki's athletic friend who is in the softball club. She has a crush on Hira-senpai of the baseball club. Kanami is often depicted as a strong tomboy but also has a cute side to her: hates ghost stories, likes sweets and love talk.


 * Mina Nono (野々 三奈)
 * Isaki's artistic friend who is in the art club. She has a younger brother in elementary school.
 * Isaki's artistic friend who is in the art club. She has a younger brother in elementary school.
 * Isaki's artistic friend who is in the art club. She has a younger brother in elementary school.


 * Usako Kurashiki (倉敷 兎子)
 * An alcohol- and cigarette-loving school nurse who is also the Astronomy Club's advisor, despite her zero knowledge of the stars. However, she provides many valuable life lessons to the students and can be responsible when the time comes.
 * An alcohol- and cigarette-loving school nurse who is also the Astronomy Club's advisor, despite her zero knowledge of the stars. However, she provides many valuable life lessons to the students and can be responsible when the time comes.
 * An alcohol- and cigarette-loving school nurse who is also the Astronomy Club's advisor, despite her zero knowledge of the stars. However, she provides many valuable life lessons to the students and can be responsible when the time comes.


 * Rui Haida (灰田 塁)
 * A blonde high schooler who likes partying and playing around. He quit the baseball club shortly after matriculation. He has had relationships before but seriously falls in love with Kanami. During the group's trip to Osaka, he confessed to Kanami but was rejected.
 * A blonde high schooler who likes partying and playing around. He quit the baseball club shortly after matriculation. He has had relationships before but seriously falls in love with Kanami. During the group's trip to Osaka, he confessed to Kanami but was rejected.


 * Haya Magari (曲 早矢)
 * Isaki's sister, who is four years older. She is a university student currently studying with her boyfriend in Kanazawa. After a sports festival during their elementary years, Haya told herself she should not feel sorry for her sister. Despite their everyday quarrels, she is shown to be caring for Isaki and trusts Ganta to take good care of her sister completely.
 * Isaki's sister, who is four years older. She is a university student currently studying with her boyfriend in Kanazawa. After a sports festival during their elementary years, Haya told herself she should not feel sorry for her sister. Despite their everyday quarrels, she is shown to be caring for Isaki and trusts Ganta to take good care of her sister completely.
 * Isaki's sister, who is four years older. She is a university student currently studying with her boyfriend in Kanazawa. After a sports festival during their elementary years, Haya told herself she should not feel sorry for her sister. Despite their everyday quarrels, she is shown to be caring for Isaki and trusts Ganta to take good care of her sister completely.


 * Kai Shiromaru (白丸 甲斐)
 * Yui's cousin, who is one year younger than Ganta and Isaki. He joins the Astronomy Club and becomes the next president when Ganta retired from club activities.


 * Akane Furukimi (古君 茜)
 * Ganta and Isaki's underclassman, who is one year younger. She joins the Astronomy Club along with her friend Suzu because she likes photography.


 * Suzu Chiura (千浦すず)
 * Ganta and Isaki's underclassman, who is one year younger. She joins the Astronomy Club due to her love for science and astronomy.

Manga
Written and illustrated by Makoto Ojiro, Insomniacs After School was serialized in Shogakukan's manga magazine Weekly Big Comic Spirits from May 20, 2019, to August 21, 2023. Shogakukan has collected its chapters into individual volumes. The first volume was released on September 12, 2019. As of October 12, 2023, fourteen volumes have been released.

In June 2022, Viz Media announced that they licensed the series for English publication. On May 9, 2023, Viz Media launched their Viz Manga digital manga service, with the series' chapters receiving simultaneous English publication in North America as they are released in Japan.

In France, the manga has been licensed by Soleil Manga.

Anime
In January 2022, an anime television series adaptation was announced. The series is produced by Liden Films and directed by Yūki Ikeda, with scripts written by Rintarō Ikeda, character designs handled by Yuki Fukuda, and music composed by Yuki Hayashi. It aired from April 11 to July 4, 2023, on TV Tokyo and other channels. The opening theme song is "Itsu Aetara" (いつ逢えたら) by Aiko, while the ending theme song is "Lapse" (ラプス) by Homecomings. Sentai Filmworks licensed the series and is streaming it on Hidive. Muse Communication has licensed the series in Southeast Asia.

Film
In January 2022, a live-action film adaptation was announced. The film is directed by Chihiro Ikeda, produced by United Productions, and distributed by Pony Canyon. The film premiered on June 23, 2023. The film was later selected by Fantasia Film Festival, to be presented at the 2023 edition.

Other media
The Japanese band Macaroni Enpitsu released a music video for their single "Enshin" (遠心), which featured art from the manga, on November 21, 2019.

Reception
In 2020, Insomniacs After School was one of the 50 nominees for the 6th Next Manga Awards in the print category. Insomniacs After School also won the Mandō Kobayashi Manga Grand Prix 2023, created by comedian and manga enthusiast Kendo Kobayashi. The series was also listed in the top 10 in the 2024 edition of the Young Adult Library Services Association's Great Graphic Novels for Teens.