Taiyo Asano has been on his own ever since his parents died and the only one who seems to care for him is his childhood friend and classmate, Mutsumi Yozakura. But Mutsumi has a secret—she is the head of a family of spies! And on top of that, her brother Kyoichiro is dangerously protective of her! To stop Kyoichiro from killing him, Taiyo and Mutsumi must take the ultimate leap—marriage! Because in the Yozakura family, family cannot kill family.

Despite wanting a quiet reborn life, this former college girl levels up to the max as the villainess.

A spy, an assassin and a telepath come together to pose as a family, each for their own reasons, while hiding their true identities from each other.

Hatori Chise, 15 years old. Lost, without hope and without family - she sells herself to a non-human mage known as Elias Ainsworth. Hesitant, she starts a new life with him as his new apprentice.