Raised by a free-spirited father, Mei grew up without knowing the love of family. One day, she received a letter from her father saying, "I'm getting remarried, so please go to my new family's house." Mei was nervous as she headed to her new family's house, but... At first, Mei couldn't hide her nervousness about living with her new mother Shizue and her new sisters Saki and Kokoro. However, as she came into contact with the love of the women in her family, she gradually regained her cheerfulness...