Tsuruga Takashi and his best friend Tomohiko are both engaged in cutting-edge research in brain science and have been close friends for more than a decade. One day, Tomohiko solemnly introduced his new girlfriend Mayuko to him. He was shocked to find that she was the woman he had fallen in love with at first sight but missed. Takashi's heart was full of love and hate, and he was tortured by jealousy and self-blame and was on the verge of collapse. However, overnight, Mayuko had taken it for granted that she was living with him and never mentioned Tomohiko. Tomohiko, who was originally dedicated to the study of human brain memory, also disappeared. Takashi was gripped by a huge anxiety...