Kaiyuu Hiyama

Kaiyuu Hiyama (檜山界雄 Hiyama Kaiyuu?) is a first year high school student and plays the role of a percussionist. He dropped out of school for at least a year before returning. He's a former radio show host for the Seven Sages' Advice podcast.

Appearance
Kaiyuu is a lean, slightly tall teenage boy with straight grayish-brown hair tied in a pony tail and lazy-looking brown eyes. He is usually seen slumped over a bit and holding red timpani mallets. His signature outfit is his green sweater over his school uniform.

Personality
Saiyuu is laidback all of the time, but he is not lazy. He tends to bring up good points in cases, as he is described as "intellectual" by Haruta during a case.

Naoko Serizawa
It was revealed that Kaiyuu and Naoko are childhood friends as Kaiyuu calls her by her first name.