Kazuki transferred to Amanogawa Gakuen in the middle of the school year. His childhood friend Honoha invited him to the unofficial ‘family club’ where the members pretend to be a family. In addition to the club leader Ougi and imouto-like kouhai Runa, they are soon joined by a robot Misora, the student council leader Mikage, his classmate Yuuki and energetic kouhai Suzu. For Kazuki, who had lost his family at a young age, he did not understand at first the meaning of family nor the purpose of the club, but he felt at ease with kind people at his side. Gradually after spending more and more time with them, they become precious to him, just like ‘family’.