In junior high, Ryu and Zen were basketball teammates. Now in high school, they’ve taken different paths—Zen plays on the school team, while Ryu earns money playing underground betting basketball run by gangs. One day, Zen’s basketball team faces disbandment when senior members are caught using drugs.

With an important match approaching, the team goes on a training retreat. Tensions flare between Ryu and Zen, prompting the coach to tie their wrists together and force them to spend 24 hours as a pair. During this time, Atom visits, adding fuel to Ryu’s jealousy.