Minamoto Kenjiro is an ordinary high school student who attracted to a girl named Tsukinaga Chinatsu. At first, Tsukinaga appears to be a quiet and gentle girl. However, as time went on, Minamoto began to notice that there was something unnatural about her personality.

When they started dating, Minamoto began to feel that Tsukinaga was being overly possessive. She often controls his life even curb every aspect of Minamoto relationship with the others. Her jealousy is very high and she doesn't like it when Minamoto have a good time with the others.

Minamoto feels trapped in a dangerous relationship, but at the same time, he feels attached to Tsukinaga and feels the vibrations in their relationship. As Tsukinaga becomes increasingly obsessed with Minamoto, Minamoto must find a way to deal with Tsukinaga's yandere trait without endangering himself or those around him.