Hiyorimi Hiro moves to a new city to live with his older sister, but he dies before he can track her down. He comes back to a new life as the servant of a princess from the Monster Realm, who turns out to employ his sister as well. Because the princess stands in line for the royal throne, monsters keep turning up to attack or harass her, and Hiro must shield her even if it costs him his life again and again. The three-episode OVA adapts Mitsunaga Yasunori's manga and mixes action, horror, comedy and the supernatural.