Manabu, who was working as a magazine editor in Tokyo, was worried that his work was not going well. At that time, he was suddenly called by his father to go home. There, he was introduced to his father's remarriage partner and former teacher, Rina. Manabu feels embarrassed and angry at the fact that the woman she admired has become her mother-in-law, and jealousy ignites. Unable to suppress his desire, he crossed the line. Since then, Manabu has relied on her kindness and has been in a relationship many times.