He's the homeroom teacher of the class which Naoyuki and Kana attend. He is usually in a bad mood and very violent towards the pupils when there is something that annoys him. In the end his personality softens.

Asaba Naoyuki is an ordinary high school student. As a member of his school's press club, he's just spent the summer camping outside the local military base, in hopes of seeing the UFOs that are secretly kept there, according to local legend. Returning to school, he meets a strange girl, Iriya Kana, and gradually comes to realize that she is more than merely strange - and that a dark secret lies beneath the world that he knows.
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(Source: Anime News Network)

Taizou Kawaguchi