Shun Mitaka is the coach of the tennis club that Kyoko attends, and is the rival of Godai for her love and attention. He and Godai recognized each other as rivals from the moment they met.

Shun is notorious for being a ladies' man, and is a stud in every sense of the word, from his good looks, athleticism, and way with words, to his trademark shining white teeth, he is everything Godai is not. He had some childhood trauma concerning dogs, so he has a crippling fear of them. He comes off as a spoilt child of fortune, but is actually a really good and assiduous guy who truly loves Kyoko and is worried about letting someone unreliable have her.

He wooed Kyoko quite boldly, but ironically that approach actually strengthened Kyoko's feelings towards Godai in most cases.