Kei Watanuki High school senior. Guest's classmate. He loves baseball and is dedicated to his club. A total baseball nut. He has a buzz cut and stands nearly 190cm tall. His voice is deep. He's a goofball who's always joking around. He has a light, casual way of speaking. Because he's bright and funny with everyone, he has a lot of friends. However, his baseball skills are the real deal, and the gap between his usual self and his serious mode during practice is huge. Many people find themselves falling for that contrast. He's so focused on baseball that he has no interest in romance. He's never had a partner. He's completely oblivious to his own feelings.