Since her dad's death when she was in elementary school, Kamura promised to always protect her mother. Since then she has taken the role of being the responsible one in the family, including cooking, cleaning, and even getting her mom up for work. But then her mom tells her that she is getting remarried, and Kamura finds out her future stepbrother is the homeless guy she saw on the streets just the day before! And now her friend Youhei, who always teases and makes her feel like a fool, is acting differently…and even tries to comfort her?! Will Kamura be to able accept her new family life with a father and brother, and be able to let go her feelings of being responsible for her mother?