纽约。有着非凡的姿容，和卓越战斗力的少年·亚修。统领街头暴力团的他听到了，被手下所杀的男人在临死之际说出的“BANANA FISH”的神秘话语。与此同时，他与作为摄影师的助手来取材的日本少年·奥村英二相遇。两人决定一同追寻“BANANA FISH”之谜——

在灾后重建的火星上，一群保全公司的儿童成员奋力抵抗背叛他们的成年人和残暴的地球政府。

High schooler Masahiro Setagawa is a fairly helpless delinquent, so much so that the neighborhood bullies use him to run their errands. His life changes when he meets high school teacher Kosuke Oshiba, a man whose fighting abilities have earned him a powerful reputation on the streets. Oshiba finds himself with a desire to protect Setagawa, and despite swearing that he's not interested in men, Setagawa finds himself getting more involved in Oshiba's affairs.