Pico finds a boy named Chico swimming nude in a stream, and the two become friends. Later at Chico's house, Chico takes Pico to his attic, where the two spy on Chico's sister masturbating. Pico then shows Chico that boys can also do this, and the two have sex.

Pico and Chico meet a pretty, feminine-looking runaway named Coco who lives in a hideout underneath the subway. Pico slowly begins to fall in love with Coco, causing him to question his feelings for Chico. The situation becomes exacerbated when Pico catches Coco and Chico having relations one night. Eventually, they reconcile, having a threesome atop Tokyo Tower.