Aru is a "hero", divine beings incarnated in physical bodies, he has renounced the kingdom of heaven along with his companions Ama and Yon to defend human beings from the Kami-sama, these nature spirits are trying to extinguish them, but one day he meets Aya, a Kami-sama who claims to have been waiting for him and to be in love with him.
Aru is a handsome and tall man, with curly violet hair, brown eyes, and extremely fair skin, with a mark on his back in the shape of a circle with a blue dot in the center, at the level of his heart. He adopts the life of an 18-year-old college boy with his classmates, tries to be a person who follows all the rules, despite having defied divine laws to protect humanity, and seeks to make Aya a "good person" to be happy, without realizing that this is not his nature.