From classmates in school, they turned into stepbrother and stepsister who also live under the same roof.
After his father’s second marriage, Asamura Yuta “gets,” as a “gift,” a step-sister—Aayase Saki, who just happens to be the number one school beauty of that year. Having learned important personal values about relationships between a man and a woman from their parents’ previous marriages, they promise each other not to get too close, not to be too hostile, and simply to keep a boundary and a comfortable distance.
Saki, who worked alone for her family, doesn’t know how to properly rely on others, while Yuta doesn’t know how to handle her in real life. Standing on fairly equal footing, these two slowly learn the feeling of comfort that comes with living together.
Their relationship gradually improves every day. In the end… it might even turn into a love story…