Sakasaki Mamoru

Basara Toujou's homeroom teacher.[spoiler]He was killed by the god Ornis prior to the start of the series. The Sakasaki that appears throughout the story is in reality Ornis in disguise.[/spoiler][spoiler]Ornis attempts to kill Basara because he believes the latter has gotten too close to Chisato Hasegawa. Ironically, this prompts Hasegawa to kill him.[/spoiler]