Taiyo Asano has been on his own ever since his parents died. 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!

The battle against the crazy Momo is barely over when the Yozakura siblings get a call from Kai Izumo, president of the Spy Association. A meeting of the Gold-Ranks has been called. The agenda? Expelling the Yozakura family for Momo's dark deeds. Kyoichiro is less than pleased. As the meeting heats up, more colorful members of the association's Gold-Ranks are introduced!