Ryuichi Yagen

Personal Information

Ryuichi Yagen (薬研粒一 - Yagen Ryuichi), Seiyuu: Daisuke Kishio, Hair / Eye Color: Purple / Black, Science Teacher.

Always wearing a surgical mask, the science teacher, Ryuichi is quite a strange individual who often pick up students and have them drink experimental products of his that is said to be good for their health. He's an inventor as well although a bad one. He once made an advanced robot sphere-shaped garbage collector, but it went out of control and was possessed by an evil spirit. He seems to have liked Riku very much and always use him as his experiment subject.

Perhaps because of that, Riku think that he owe him and so decided to call upon him to build up a tent for their haunted house event during the Cultural Festival. But instead of following the blueprint that Riku has for the actual dimensions of the tent, Ryuichi went all out to build a massive tent enough filled up with countless people. However, his initiative almost brought that project to a halt, being too big for the haunted house event since Riku's class did not produce enough decorations to make it look like a haunted house. But Riku manage to solve that problem with some help from the supernatual. 

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Source from Wikipedia