The protagonist is living in a motherless home. His father is always out for business as well so he starves for parental affection.

His father found a girl and will marry her in his return from business trip. His new mother has to boot up into his family so she came to their home to live there in advance. This delighted him very much and welcomes her wholeheartedly. His sister, who has an Electra complex, welcome her in a bad grace.

His new mother, who is still a virgin and have no experience with parenting, receives the helping hand of their maid. The maid, however, took advantage of her naivety and taught her a different kind of "parenting".