Fourteen year old Kou Yamori has decided to skip school since he rejected a girl who confessed her love to him and has been harassed by her friends. He just wasn't interested in girls. One night he decides to sneak out late to enjoy the solitude of the desserted streets but meets a capricious girl in a dark cloak. Nazuna Nanakusa...

Chisato is part of a secret organisation "DA" that trains young orphan girls for their missions and name them, "Lycoris" (there's an all boys unit named, "LycoBell" too). Their sole purpose is to eliminate any signs of crime in Japan discretely without anyone ever noticing. When the cool, serious all business Takina Inoue...