Movie
Description
Shuichiro Oishi is a third-year student at Seishun Academy and the vice-captain of the school's tennis club. In the film The Prince of Tennis: Two Samurais, The First Game, he is one of the main characters and travels with the Seigaku regulars when they are invited to take part in an exhibition tournament aboard a luxury cruise ship. The event, arranged by a wealthy tennis enthusiast, is later revealed to be tied to illegal gambling, and the team is pressured to lose on purpose, placing Oishi and his teammates in a difficult situation that tests their integrity and competitive spirit.

Oishi is known for his gentle, dependable, and level-headed nature. He is frequently described as the mother of Seigaku because he worries constantly about the well-being of his teammates and tends to put their needs before his own. He is realistic, sensible, and highly responsible, which makes him a natural support to the team's captain. Although generally mild-mannered, he also has a passionate and at times loud side that emerges when he feels strongly about something.

His primary motivation is to support and protect his teammates. He takes his role as vice-captain seriously, viewing it as his duty to keep the team steady and cohesive. This sense of responsibility extends beyond tennis. His selfless nature is shown when he injures his wrist while saving a pregnant woman from a fall, an act that briefly threatens his own tennis career. His development over time centers on resilience, as he learns to overcome physical setbacks and continues to grow as a player while remaining a stabilizing presence for those around him.

Oishi's most significant relationship is with Eiji Kikumaru, his doubles partner. The two are known across Japan as the Golden Pair, a team built on deep mutual trust and an almost instinctive understanding of each other's movements. In their matches, Oishi typically takes the role of the rear guard, using his calm judgment and wide field of vision to coordinate their play, while Kikumaru attacks from the front of the court. He also serves as a steady counterpart to the more reserved captain Kunimitsu Tezuka, and he is protective of the younger members of the team.

On the court, Oishi is a right-handed counter-puncher who relies on precision, consistency, and reading his opponent rather than power. His signature technique is the Moon Volley, a high-lobbed topspin volley that lands with notable accuracy on the opponent's baseline. He can disguise the shot's wind-up to draw opponents to the back of the court before dropping the ball short. In doubles, he employs tactics such as the Australian Formation, and when his partner is exhausted he can hold the court alone to buy time for recovery. Together with Kikumaru, he is capable of an advanced level of synchronized play that has been hailed as a miracle of doubles, allowing the pair to anticipate each other and cover the court with near-perfect coordination.