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Tetsuhiko Kai (甲斐 哲彦, Kai Tetsuhiko) is one of the supporting characters in the Osananajimi ga Zettai ni Makenai Love Comedy series.
Tetsuhiko is a really good-looking guy.
Tetsuhiko looks good, but tends to enjoy the situations that Sueharu gets in. He always stay on the side his can get some benefit.
Tetsuhiko has been three-timing girls, but as he was eventually caught, he became known for his "trash" behavior and hated by the girls. Every time he tries to talk to a girl from his class would result in them complaining or insulting him. Because of that he started to look for girls from other schools where he states he is even seven-timing them.
He is easily able to read Sueharu Maru and realize his love interest and his plans for the Confession Festival.
- Sueharu Maru: Tetsuhiko best friend. They both have a great chemistry, but Tetsuhiko tends to have fun at his expenses.
- Kuroha Shida: They're occasional allies.
- Rena Asagi: Tetsuhiko half-sister, who attended the same middle school as him. Even if they aren't that close to each other, Tetsuhiko tries to help her.
- Shun Hardy: Tetsuhiko's father. They have a cold relationship.
- The name Tetsuhiko means "philosophy, clear" (哲) (tetsu) and "boy, prince" (彦) (hiko).
- Tetsuhiko's surname Kai means "worth, avail, effect" (甲斐).