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.

Ryu joins the school team and is reunited with Zen, but the other members treat him like a delinquent. Meanwhile, the gang that controls the street basketball scene grows impatient as Ryu stops showing up, and they resort to drastic measures.

After confessing his feelings to Zen, Ryu and Zen’s relationship takes a turn. But Ryu is abducted by the gang trying to lure him back. Zen, worried after losing contact with Ryu, tracks his location and charges into the gang’s hideout alone to save him.

The team progresses to the upper rounds of the tournament, but their funding is cut, threatening their participation. Ryu refuses to speak with his mother, the alumni association president. To raise funds, the team decides to run a dunk tank at the school festival. Meanwhile, the coach, previously sober, starts drinking again.

Zen’s grandmother suddenly collapses and is hospitalized. Faced with costly surgery, Zen is at a loss. Atom proposes entering a 3-on-3 basketball tournament to win the prize money. He, Zen, and Ryu form a team and strive to win together.