The Sagemia family is cursed, and this curse inexorably draws all its members to the mixing of blood. The main character, Misaki, and her younger brother, Shun, persistently try to resist this family curse. However, soon the older brother loses the last remnants of his composure...

Sayaki is the daughter of famous parents who suddenly disappeared one day. At the same time, she found a part-time job at a family restaurant, where her boss told her that her parents' disappearance was related to their debts. They can be refunded, but it requires paying a significant amount.

Asato and Akane, who have recently married, have just started their life as a family. On the first night after the wedding, they were ready to retire, when suddenly their childhood friend Akane came to them, asking for permission to stay with them for a while.

Masaru will graduate soon, but he still hasn't found a job. In his free time, he often visits the Hidamari Cafe, which belongs to friends of his parents. Two of his girlfriends, Nanami and Kurumi, work there.