Fuji is a third year student at Seishun Academy. The middle child of three, he has an older sister, Yumiko, who is very attractive and admired by his friends; his younger brother is Yuta, who was a student at Seigaku, but transferred to St. Rudolph. Fuji is a leap year baby, only getting to properly celebrate his birthday properly every 4 years. He is given the title "tensai", or genius, due to his tactical skill on the tennis court. Fuji's most famous moves are known as the Triple Counters: Higuma Ootoshi ("Bear Drop") for returning smashes; Tsubame Gaeshi ("Swallow Return") which runs on the ground without bouncing, effective against players at the baseline; and Hakugei ("White Whale"), a shot that uses the wind to hop straight into the air and return to Fuji on the bounce, effective against players at the net. During the nationals, he creates more effective versions of his Triple Counters; three more original counters to deal with complex spin shots, low spin shots, and net balls; and even masters how to play with his eyes closed. In addition, Fuji has an underhand serve that seems to disappear when the opponent is about to hit it. A running gag in the series is that Fuji has interest in or else near-immunity to strange foods and drinks that others would find revolting to the point of fainting. Should he ever pass out from consuming any of the strange concoctions Inui or other data tennis characters come up with, the item in question is deemed a true terror.