Ryouma Echizen and the Seishun Academy boys" tennis squad receive an invitation to play a showcase match on a high‑end cruise liner owned by Hikomaro Sakurafubuki. Upon arrival, the players are stunned to learn that Ryouma"s older adopted brother, Ryouga, leads the rival side. In their opening rallies, Seishun overwhelms opponents, drawing cheers from the ship"s audience. Yet odd details emerge—cheap sushi in the dining hall and a bathroom adorned with marble wallpaper.
The gleaming decks, crystal‑clear pools, and a lavish dining area masked the sinister plot. Yet beneath the glittering façade, the crew"s eyes flickered with menace, and whispers of a hidden agenda floated through the air in the shadowy corners of the ship.
Sensing foul play, the group discovers Sakurafubuki orchestrates an illicit betting scheme that forces them to forfeit upcoming sets so he can pocket a hefty payout. On the first day, opponents were instructed to lose deliberately, encouraging heavy wagers on Seishun"s triumph. Failure to comply would endanger the youngsters, as every crew member is armed and allied with Sakurafubuki, including Ryouga.
Relying solely on their own abilities, the team must combine skill and wit to outmaneuver the danger surrounding them. As Seishun resolves to fight for survival, the two sons of Samurai Nanjiro clash to decide who is the superior player.
Production I.G Japan