Koharu is a child welfare services staff whose mother abandoned her when she was young, leaving her with heavy feelings of envy and longing towards mother figures. One night, a wave of unfortunate events suddenly thrusts Koharu into a pit of despair. She is rescued by Daigo, a rich doctor in private practice she meets by coincidence. Koharu is drawn to Daigo, a strong figure who alleviates all of Koharu’s problems. Daigo is a widower, raising his only daughter Hikari by himself. One day, Daigo proposes to Koharu, asking her to “become Hikari’s mother.” Koharu would live a life envied by all ... or so it seemed.