The hero Toru Seo who writes down the overflowing delusional situation in a notebook called Propensity Diary. It is a masturbation act that replaces masturbation, suppressing the overflowing libido! No one understands this hobby and I wouldn't be able to do her, he thought. One day, when Toru, who had forgotten his notebook in her classroom, hurriedly returned to pick up, there was a figure of his classmate Otori Chikage who masturbates with Toru's propensity diary in one hand. .. Suddenly her harem state surrounded by heroines who accept and understand her propensity that she thought would never be accepted! His real and eroge -like everyday life began in this way! A girl who accepts all the delusional duero situations of peculiar habits. An erotic story that thoroughly enjoys intense sex with such a girl!