Irregulars

• Name — Irregulars • Ja Kanji — イレギュラーズ • Ja Romaji — Iregyurāzu • Genre — Sports (baseball)

• Type — manga • Author — Naoki Matsumoto • Publisher — Kodansha • Imprint — Shōnen Magazine Comics • Magazine — Magazine Pocket • First — April 28, 2021 • Volumes — 21 Irregulars is a Japanese manga series written and illustrated by Naoki Matsumoto. It began serialization on Kodansha's Magazine Pocket service in April 2021, and has been compiled into 21 volumes as of August 2026.

Jyosei Academy was once a school with a negative reputation but had a notable baseball program, having won the Kōshien baseball tournaments multiple times. However, after it rebranded itself as a elite prep school, its baseball team became neglected, with the academy's focus on academics leading to a decline in interest for non-academic matters. With only four members left, the team members have been branded as "irregulars" by the school community. However, Ruito Hibino, one of the team's players, has not given up on his dream on bringing the team to its former glory. Needing more members in order to form a full team, Ruito learns that Jyosei's team will combine with another team in tournaments. However, he then finds out that the other team is the Meikyo High School baseball team, Meikyo being a school notorious for its delinquency and is considered the worst school in the Kantō region.

• Ruito Hibino • A second-year student and a member of Jyosei Academy's baseball team. He admired Jyosei's team when he was younger and aimed to become part of their baseball team, despite his skills lacking at the time to the point he would only usually play as a substitute. • Kiichi Kinose • A second-year student and a member of Jyosei Academy's baseball team. • Chiaki Mizushima • A second-year student and a member of Jyosei Academy's baseball team. • Shoutaro Kagari • A member of Meiko High School's baseball team. He was once a skilled and widely admired baseball player in junior high school and was expected to reach Kōshien, but after a certain incident had disappeared from the map. • Kouki Chiyozuka • A second-year student and a member of Meikyo High School's baseball team. • Erisu Keito • A second-year student and a member of Meikyo High School's baseball team. • Yasuhiro Toganō • A second-year student and a member of Meikyo High School's baseball team. • Kazumi Kaneko • A second-year student and a member of Meikyo High School's baseball team.

The series is written and illustrated by Naoki Matsumoto, who began serializing it on Kodansha's Magazine Pocket service on April 28, 2021. The first tankōbon volume was released on August 17, 2021; In a video collaboration with former baseball player Tomoya Satozaki, Matsumoto drew nine baseball players in manga form, imagining them as if they were characters in a manga. Twenty-one volumes have been released as of August 17, 2026.