Yoichi Saotome (Anime)

Yoichi Saotome 「早乙女 与一, Saotome Yoichi」 is a member of the Japanese Imperial Demon Army's Moon Demon Squad.

History
In the past, his family was attacked by vampires and his sister was killed trying to protect him whilst he remained hidden underneath the bed. This incident stimulated his desire to fight against the vampires in order to avenge his sister's death.