The protagonist of this game is a shinigami.

Shinigami (死神, "death god" or "death spirit") is an entity in Japanese folklore that is responsible for seeing that a person dies at their appointed time and then guiding their spirit to be judged in the afterlife. In this respect, Shinigami are related to the Western concept of the Grim Reaper. Though the Grim Reaper is a single entity, there are multiple shinigami which are often imagined as working together. Shinigami are a relatively recent addition to Japanese folklore.