Rikuro Tachibana

A high school student who was abducted by slavers during a school trip. He was saved by Annerose and signed a contract with her, according to which he became an undead and pledged to serve her. He can't die while the witch is alive. Rikuro is a pessimist and feels useless, as he cannot single—handedly defend Annerose. He believes that no one but him can have intimacy with her. He competes with Mitiko for the attention of the mistress.