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.

Kyoichiro vanishes leaving only a note behind that says Don't look for me At first everyone thinks it's just another one of his typical sulking fits and they take advantage of his absence to cut loose. But it doesn't take long for them to realize he's actually pursuing Momo. The whole family goes after him only to stumble across a shocking sight