Shitenhoji Middle School (四天宝寺中学校 Shitenhōji Chūgakkō?) is one of the strongest teams in the Kansai region. Though the team loses to Rikkai in previous year's semi-finals, the members puts up the strongest fight against Rikkai with more willpower than any other team's. During the course of the series, they defeat Fudomine in the National Quarterfinals, but once again lose in the semi-finals, this time to Seigaku.
- Year Founded: 1912 (Showa Year 4)
- Student Body: 1086
- Location: Osaka, Japan
- Coach: Osamu Watanabe
- Captain: Shiraishi Kuranosuke
- Vice-Captain: Koishikawa Kenjirō
The school motto is: "The first who laughs first, wins!" To support their motto, Shitenhoji provides classes related to comedy and their principal is infamously known for his jokes.
Shitenhōji is shown to be the strongest team from Kansai as they are winners of the Kansai Tournament having defeated Makinofuji in the final this year. Although they lost to Rikkai Dai Fuzoku in last year's National semifinals while being led by Shiraishi, who was only a 2nd year then after ex-captain Hara Tetsuya resigned, the consensus is that they gave Rikkai a much tougher fight than Makinofuji Gakuin did in the finals. They did not make it to Singles 1, so Shiraishi did not play, leaving it a mystery as to what his abilities were for the competitors of the Nationals during the main storyline a year later.
During the Nationals of the main storyline, while Makinofuji and last year's Best 4 Shishigaku tumbled out in their first matches this year, Shitenhōji, boosted by the new additions of Shishigaku's Chitose Senri and super rookie Tōyama Kintarō, remained a top contender for the National title. Unfortunately, Shitenhōji was unable to exceed last year's performance and ended another year at the semifinals by losing to Seishun Gakuen.
As the team comes from Kansai they are all shown to talk in Kansai-ben (Kansai Dialect), with a special mention and an evident accent for Shiraishi, Kenya and Kintarō.
After Nationals, most of the Shitenhoji regulars (Shiraishi, Kenya, Zaizen, Gin, Kintaro, Koharu, and Chitose.) were invited to the U-17 Camp, a place traditionally restricted to high school tennis players.
Tennis Team Members
OB's (Old Boys)
- Shiraishi Kuranosuke (Captain)
- Koishikawa Kenjirō (Vice-Captain)
- Oshitari Kenya
- Ishida Gin
- Chitose Senri
- Konjiki Koharu
- Hitouji Yūji
- Shitenhoji is the team that has the most left-handed regulars which is five. Since Shiraishi, Ishida, Chitose, Hitouji and Zaizen are all Lefties.
- Whenever the Shitenhoji regulars encounter problems/arguments in the club, they would all go out to eat Nagashi Soumen and talk things out.