Judo has an image of dirty and hard training, so Judo manga used to have a lot of these scenes. "Tighten your black belt hard!" is a new type of Judo manga which draws Judo "clean".
This manga was written between 1988 and 1997 by Katsutoshi Kawai, a new writer at that time; Katsutoshi Kawai is now writing other manga.
The hero is Takumi Kogawa, a high school student. The main characters are his four friends, his girlfriend, and his girlfriend's friend. The story begins with these characters meeting together and making a judo club that didn't exist at their school.
Takumi Kogawa has a model, Toshihiko Koga, a popular Judo player.
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