From 1988 to 1996, the legendary delinquent manga "BADBOYS" by Hiroshi Tanaka, which boasts a total series circulation of 55 million copies, was serialized in "Young King." Kazunari Mamehara (JO1), making his first-ever film starring role, plays the protagonist Tsukasa Kiriki, while the members of Gokurakucho, with whom Tsukasa forms lifelong bonds, are portrayed by Rihito Ikezaki (INI), Jutaro Yamanaka, and Sora Inoue. In addition, the theme song is JO1's latest track "Be brave!", written specifically for this film.