After losing her husband, Chisato worked as an office lady during the day and at an izakaya at night to raise her two siblings. Aoi, the daughter, loved her mother very much. She admired her mother, but before long, that love turned into a love that went beyond that of a mother and daughter. One day, her younger brother planned a family trip with his first bonus. Aoi agreed to the plan and invested in it, but at the last minute, something came up and it ended up being just the two of them, mother and daughter.