Oblivion Battery

• Ja Kanji — 忘却バッテリー • Ja Romaji — Bōkyaku Batterī • Genre — Sports (Baseball)

• Type — manga • Author — Eko Mikawa • Publisher — Shueisha • Imprint — Jump Comics+ • Magazine — Shōnen Jump+ • First — April 26, 2018 • Volumes — 23

• Type — ona • Director — Parako Shinohara • Studio — MAPPA • Released — October 11, 2020 • Runtime — 20 minutes

• Type — TV Series • Director — Makoto Nakazono • Writer — Michiko Yokote • Music — * Tomoki Kikuya • Hiroko Yamasaki • Studio — MAPPA • Licensee — * Crunchyroll • Network — TXN (TV Tokyo), AT-X • First — April 10, 2024 • Episodes — 12

• Portal — yes Oblivion Battery is a Japanese manga series written and illustrated by Eko Mikawa. It has been serialized via Shueisha's online manga app Shōnen Jump+ since April 2018, and has been collected in 23 tankōbon volumes as of January 2026. An original net animation (ONA) adaptation produced by MAPPA streamed in October 2020 as part of the Jump Special Anime Festa 2020 online event. An anime television series, also by MAPPA, aired from April to July 2024. A second season is set to premiere in 2027.

In the world of middle school baseball, Haruka Kiyomine and Kei Kaname are the genius battery who were once feared by everyone. This includes Taro Yamada, who after competing and losing to them, decided to quit baseball and go to Kotesashi High School, a school with no baseball club. However to his surprise, he encounters Haruka and Kei and discovers that Kei suffers from amnesia — losing all memory of playing baseball and is refusing to play again. Joining the newly established baseball club, Taro and Haruka decide to bring Kei back to baseball by showing him the fun of it. They are also joined by Aoi Todo and Shunpei Chihaya, two other genius baseball players who had also quit baseball after getting crushed by Haruka and Kei. The five begin once again living their baseball life.

• Haruka Kiyomine • Yoshimasa Hosoya (ONA), Toshiki Masuda (TV series) • A genius pitcher whose pitch reached a top speed of 148 km/h on a sharp, curving slider. Despite this he is only interested in "throwing the ball" and "playing baseball with Kei," relying almost entirely on Kei for training, health management, and team communication. After Kei lost his memories, Haruka turned down offers from prestigious schools and followed Kei to Kotesashi High School. • Kei Kaname • Mamoru Miyano (ONA and TV series) • Kei is Haruka's childhood friend who was once a genius right-handed catcher and left-handed batter who led the team to victory with his calm and collected leadership, but due to memory loss he lost both his knowledge and interest in baseball, and has somehow become a playful, perverted person. His memories occasionally returns to his former self. It is later revealed that this change is not a memory issue but caused by split personality. • Taro Yamada • Jun Fukuyama (ONA), Yuki Kaji (TV series) • The everyman as well the narrator for the most part of the story. In middle school, after realizing his own mediocre talent in a match against Haruka and Kei, Taro decided to quit baseball and enrolled to Kotesashi High School. Taro is sensible and gentle, but often makes harsh remarks about Kei's behavior in his monologue. • Shunpei Chihaya • Yoshitsugu Matsuoka (ONA), Nobunaga Shimazaki (TV series) • A second baseman with excellent batting eye, bat control, and speed. In middle school, he worked hard to make up for his undersized physique with technique and theory, but after a match against Haruka and Kei, he was confronted with his own weaknesses and quit baseball. He considered baseball a waste of time and enrolled at Kotesashi High School. • Aoi Todo • Tatsuhisa Suzuki (ONA), Yōhei Azakami (TV series) • A shortstop with a powerful arm and hit. In middle school, a mistake he made while playing against Haruka and Kei's team led to yips, which prevented him from throwing to first base. He decided to quit baseball and enrolled to Kotesashi High School. Although he appears to be rough and confident, deep down he is an earnest person. At Kei's suggestion, he dealt with his yips by throwing the ball back with one bounce and ultimately overcame it during the summer game against Teitoku in his first year. In his second year, he became the fourth batter. • Kazuki Tsuchiya • Yoshitaka Yamaya (TV series) • A former softball player. He's not physically strong, but his speed rivals Chihaya's. Having struggled to fit into the "baseball club" system in middle school, he escaped into fictional "baseball" in games and anime, but nevertheless still loves the sport itself. He lacks hitting power, but in the game against Teitoku, he teamed up with Chihaya, who bats first, to pull off a double steal using his speed.

• Eiichiro Kokuto • Takeo Ōtsuka (TV series) • Hironobu Makita • Mark Ishii (TV series) • Shuto Kirishima • Kengo Kawanishi (TV series)

Oblivion Battery is written and illustrated by Eko Mikawa. The series began in Shueisha's Shōnen Jump+ online manga app on April 26, 2018. Shueisha has compiled its chapters into individual tankōbon volumes. The first volume was released on September 4, 2018. As of January 5, 2026, 23 volumes have been released.

The 40th issue of Shueisha's Weekly Shōnen Jump released on September 7, 2020, announced that the series would be adapted into an original net anime (ONA) as part of the Jump Special Anime Festa 2020 online event. The ONA is animated by MAPPA and directed by Parako Shinohara, with Noriko Itou as character designer and chief animation director, and Hisako Akagi as art director. It was streamed as part of the event on October 11, 2020.

An anime television series adaptation was announced on August 3, 2023. It is produced by MAPPA, and directed by Makoto Nakazono, with assistant direction by Takeshi Iida, scripts written by Michiko Yokote, characters designed by Hitomi Hasegawa, and music composed by Tomoki Kikuya and Hiroko Yamasaki. The series aired from April 10 to July 3, 2024, on TV Tokyo and its affiliates. The opening theme song is "Lilac", performed by Mrs. Green Apple, and the ending theme song is "Wasurena Uta", performed by Macaroni Enpitsu. Crunchyroll licensed the series. Medialink licensed the series in East, Southeast Asia and Oceania (except Australia and New Zealand), and is streaming it on its Ani-One Asia YouTube channel. A second season of the anime series was announced on November 10, 2024. It is set to premiere in 2027.