Mika Kuroda is engaged to Toru Sakurai, a high-skilled man working for a trading company. Asai Kota, a part-time worker, is a reliable person who helps Mika with her work without looking uncomfortable. One day, Mika receives a message from a creepy account, which is the start of a series of inexplicable events around her... Meanwhile, Tohru, hiding from her fiancé Mika, becomes intimate with Hinata Hirose, whom she met for some reason...? A horrible revenge drama between women is about to begin...