With her jet-black hair, sinister smile and silent demeanor, Sawako "Sadako" Kuronuma always had trouble fitting in. But her whole life changes when she befriends the most popular boy in class, Shota Kazehaya. Can love trump her cursed life?

Even though Sawako is dating Kazehaya, lately he's been distant. When the class Christmas party inspires the bristly Chizu and even insecure Yano into taking the next step in their relationships, Sawako takes drastic action to finally reach Kazehaya.