Arisu's father was hospitalized for a terminal illness during her high school years. Despite his facade of cheerfulness, she knew he fretted over leaving her alone in the world. In a bid to reassure him, she requested his 26-year-old physician, Ichinose Tatsuya, to feign a romantic relationship with her. Unfortunately, her father's condition deteriorated rapidly, and in the midst of her despair, Dr. Tatsuya disclosed some life-altering news.