A boy in [Saku](https://anilist.co/character/208618/Saku-Chitose)'s class. Atomu is part of a different clique within Fuji High, and isn't a fan of Saku or his friend group. He's a friend of [Nazuna Ayase](https://anilist.co/character/268034/Nazuna-Ayase)'s and has known her since middle school.

Being popular isn’t easy. It’s hard to beat Saku Chitose. The most popular kid in his high school? Check. An ironclad reputation that can weather even vicious online attacks? Check. A group of friends as attractive on the outside as they are inside? Check. But when a teacher asks for his help bringing back a student who has been shut away in his room for months, Saku’s perfect world will never be the same. What is this, some kind of normie harem story...? 
 
(Source: Yen Press)
 
Note: The first episode has an extended runtime of ~34 minutes.

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Being popular isn’t easy. It’s hard to beat Saku Chitose. The most popular kid in his high school? Check. An ironclad reputation that can weather even vicious online attacks? Check. A group of friends as attractive on the outside as they are inside? Check. But when a teacher asks for his help bringing back a student who has been shut away in his room for months, Saku’s perfect world will never be the same. What is this, some kind of normie harem story...? 
 
(Source: Yen Press)
 
Note: The series won the Award of Excellence in the 13th installment of the Shogakukan Light Novel Award in 2018 under the title "Ramune no Bin ni Shizunda Biidama no Tsuki" (ラムネの瓶に沈んだビー玉の月). It was later renamed to "Chitose-kun wa Ramune Bin no Naka" for the official publication.

Atomu Uemura