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. Momo brainwashes Futaba and Shinzo, leaving the spy association HQ with both of them in tow. Swearing to get them back, the remaining siblings begin to prepare. Mutsumi, hoping to charge everybody's batteries for the coming battle, gets Taiyo's help making the Yozakura family's secret recipe for Black Cherry Blossom Noodles. While they chow down, Shion manages to track down Momo's ship!.