Blue Flag (manga)

 is a Japanese manga series written and illustrated by KAITO. It was serialized on the "Shōnen Jump+" manga website from February 2017 to April 2020.
Publication.
The series is written and illustrated by KAITO. It started serialization on the "Shōnen Jump+" manga website on February 1, 2017, and ended on April 8, 2020. It has been published in eight "tankōbon" volumes.
At Anime Expo 2019, Viz Media announced they licensed the series in English. "Manga Plus" also published the series in English. It is also licensed in French by Kurokawa, in German by Carlsen Verlag, in Italian by Panini Comics, and in Spanish by Editorial Ivrea.
Reception.
The series was a finalist for the 2020 "Los Angeles Times" book prize in the graphic novels category. The Young Adult Library Services Association listed the series in the top ten in their 2021 list of the 126 best graphic novels for teenagers.
Rebecca Silverman from Anime News Network gave the first four volumes an A-, praising it for the art, characters, and story, while criticizing it because sometimes some characters can feel overly abusive or shy. Melina Dargis from "The Fandom Post" gave the series heavy praise for its story and characters, saying it was the best high-school slice-of-life manga of the year by far. Like Silverman and Dargis, Demezela from Anime UK News praised the story, artwork, and characters, ultimately rating the first volume a nine out of ten.