Romance! A crazy, overprotective brother! And.spies?! 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. The second Operation: Yozakura Front Lines reaches its final stage! Asa declares that he'll eliminate the twins Alpha and Hifumi, but the Yozakura siblings refuse to let that happen. Vicious battles break out between the Yozakura family and Asa's four children in Teiou Academy. Meanwhile, Taiyo and Kyoichiro make their way to Asa's mothership, the Behemoth . But waiting for them at its doors is the last person they expected!.