Sadaharu Inui is the analytical powerhouse of the Seigaku tennis team, a third-year student known as the "Data Man" for his signature "Data Tennis." He doubles as a team manager, caring for his teammates, but is also infamous for forcing them to drink his disgusting homemade "Inui Juice" as a penalty.
Sadaharu is a tall and slender student, having grown from 184cm to 185cm.
He is never seen without his signature glasses, which consistently obscure his eyes from view.
As Seigaku's "Data Man," Sadaharu is highly intelligent, meticulous, and analytical, constantly collecting data on everyone and everything.
He shows a caring side in his managerial duties but also possesses a notable sadistic streak, seemingly enjoying the reactions his teammates have to his grotesque "Inui Juice."
His intellectual pursuits extend beyond tennis to games like chess and TRPGs, reflecting his strategic mind.
His personal motto is: "Wisdom is a treasure for all ages."
Sadaharu is a 3rd-year student in Class 11 at Seishun Academy Junior High, and he graduated from Midorikawa Daiichi Elementary School.
Before the start of the series, he was the third-strongest player on the Seigaku team, behind only Kunimitsu Tezuka and Shusuke Fuji.
He is a childhood friend of Renji Yanagi from Rikkai Daigaku Fuzoku, having played tennis together for years.
Tennis Style
Sadaharu's primary strategy is "Data Tennis," where he uses extensive data to predict his opponent's moves and counter them with high probability.
He is a Serve & Volleyer who utilizes his height to deliver powerful serves.
His special moves include the High-Speed Serve, the Super High-Speed Serve, Waterfall, and, humorously, "Peeling wallpaper in the bathroom stall."
Other Skills
He has a notorious talent for concocting "Inui Juice," a series of horrifically tasting health drinks that have become a staple punishment for the team.
He excels at various strategy games, including Othello, Shogi, Chess, and Go.
Sadaharu is also skilled in administering first aid.
Renji Yanagi
Renji is Sadaharu's childhood friend and greatest rival in the world of data tennis.
They know each other's styles inside and out, leading to intense and highly strategic matches. Together, they are known by the fan nickname "Doctor and Professor."
Kaoru Kaido
After regaining his spot on the team, Sadaharu frequently pairs with the tenacious second-year Kaoru Kaido for doubles matches.
Seigaku Team
He acts as a supportive manager but is feared for his role as the enforcer of penalties via his Inui Juice. He is a part of the "Glasses's" trio with Kunimitsu Tezuka and Yushi Oshitari.
The Prince of Tennis
Initially Seigaku's No. 3 player, Sadaharu loses his regular spot after being defeated by Ryoma Echizen and Kaoru Kaido in the intra-school ranking matches.
As a result, he sits out the District and Metropolitan tournaments, focusing on his role as team manager and data collector.
He makes a comeback before the Kanto Tournament, defeating Takeshi Momoshiro to reclaim his position as a regular.
During the Kanto Tournament, he and Kaido face Ryo Shishido and Chotaro Ohtori, and he later plays a singles match against his old friend, Renji Yanagi.
In the National Tournament, he participates in doubles matches against Tomoya Shiranui & Kōichi Aragaki, Gakuto Mukahi & Wakashi Hiyoshi, and finally, Renji Yanagi & Akaya Kirihara.
The New Prince of Tennis
Sadaharu joins the U-17 Japan Representative Training Camp. He was scheduled to play against Hajime Mizuki in a tie-break match but forfeited after suffering a stomachache from one of his own drinks.
After being eliminated, he underwent special training and returned as part of the "Revolutionary Army" on the 2nd Court.
During a match between Akuto Mitsuya and his friend Renji Yanagi, he takes over for Renji, who had reached his physical limit.
He wins the match and obtains the No. 17 badge but immediately gives it to the exhausted Renji.
- Voice Actor: Kenjiro Tsuda
- Musical Cast: Sota Aoyama (1st), Hirofumi Araki (2nd), Masei Nakayama (3rd), Yuta Takahashi (4th), Yusuke Arai (5th), Teruma (6th), Seiya Inagaki (7th), Ryousei Tanaka (8th), Sho Kato (9th), Daisuke Takenouchi (10th), Ikki Shiota (11th).
- Height: 184cm -> 185cm
- Weight: 62kg -> 64kg
- Blood Type: AB
- Birthday: June 3rd (Gemini)
- Family: Father (Civil Servant), Mother, and later, a cat.
- Hobbies: Previously backlighting and making people drink his juice; now updated to creating and serving his special vegetable juice and playing TRPGs.
- Likes:
- Food: Lactic acid drinks, cilantro (formerly guessed to be durian or soup spaghetti).
- Color: Black.
- Movies: Korean films.
- Books: Mystery and horror novels.
- Type: Formerly a calm, older person; now someone with a cute side.
- Date Spot: Formerly an art museum; now a factory tour.
- Dislikes: Formerly lightning and power outages; now fortune-telling, rhythm games, and choosing souvenirs.
- Most Wanted Item: Previously a new mixer; now a rotary evaporator.
- Notebooks Owned: 218 and counting.
- A strange incident was once reported where he was caught peeking into the girls' locker room, allegedly to gather data.
Related Tags
- The Prince of Tennis, The New Prince of Tennis, Inui Juice
- Seishun Academy: Kunimitsu Tezuka, Ryoma Echizen, Shūichirō Ōishi, Shusuke Fuji, Eiji Kikumaru, Takashi Kawamura, Kaoru Kaido, Takeshi Momoshiro
- Doctor and Professor: with Renji Yanagi
- Glasses's: with Kunimitsu Tezuka, Yushi Oshitari
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