Yuri, who is chubby, faces homelessness and poverty after her breakup and her grandmother's sudden demise. However, she discovers that her grandmother had been deceiving her all these years - her movie star mother is actually alive. Yuri makes her way to her mother's home and meets her three attractive step-siblings, each from a different father. Her newly found household is filled with amusing quirks, ranging from indolence and drunkenness to incestuous impulses. Sumire and Aoi, her brothers, constantly pester Yuri, while Fuyou, her sister, offers little support. Yuri soon becomes a maid in the household, catering to her siblings' needs as her mother travels the globe. Despite the chilly atmosphere, Yuri's warmth slowly seeps into the house. But will Yuri and her brothers ever be able to reconcile their differences and find common ground as siblings? Or is it already too late?