Humans and Guardians. These two races were destined to meet, as they say. Guardians were born to protect their partner, aka Humans. Legend says there are only two Duores (half-human, half-guardian) in the world. And once they meet, they will earn the strongest bond no Human and Guardian has ever had. Tsukiyomi Ikuto, a Duore, is tired of people saying good luck to finding his other Duore. He just wants to live a life by himself, no disturbances whatsoever. But as he bumped into Hinamori Amu, the other Duore, his life has taken the turn.