16 years ago a meteor had struck Earth but the area has just re-built itself. A-ko and C-ko are the latest transfer students to Graviton High. The loud talkative C-ko immediately catches the attention of class prodigy B-ko. And so B-ko tries to ruin their relation so she can have...

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...