A stage helper at Kaleido Stage. He originally wanted to be a part of the cast, but can't perform due to a heart condition, so he decided to work behind-the-scenes instead. Ken greatly admires Sora and has a crush on her, but never has the courage to confess his feelings for her. He does everything he can to help Sora out, frequently acting as her personal trainer, warning her of the dangers she might encounter, and acting as the voice of reason for the group on several occasions. Anna is determined to make Ken her partner in comedy, which he is equally determined not to do.