Tohma Seguchi

Keyboard player in Nittle Grasper and Mika Seguchi's husband. He is the head of N-G recording company and demands the best from all his contractual bands. Tohma is very protective of Eiri Yuki, and blames himself for the trauma Eiri suffered as a teenager, seeing that he was the one who hired Yuki Kitazawa in the first place. He is unfailably polite to the point where he will refer to anybody (including his wife) as -san, and appears to be a friendly and even-tempered person (if also a ruthless businessman). As the series goes on, it becomes evident that much of this is a carefully constructed mask: when Eiri is involved, Tohma has been known to be far from rational and soft-spoken.

Tohma is an anime-adaptation of Daisuke Asakura, who wrote most of the music for the series. Maki Murakami has confirmed this at Otakon when she attended in a Q&A panel. This would make Ryuichi Sakuma an anime-adaptation of Hiroyuki Takami, which would make Tohma and Ryuichi an anime-adaptation of access, one of Murakami's favourite bands. Tohma bears a striking physical resemblance to Quatre Raberba Winner of Gundam Wing. Ironically enough, both characters share the same Japanese seiyuu, Ai Orikasa. Also, they have been mistaken for each other by a few fans, though they are pretty far from being similar to each other other than looks.