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. Kengo uses his Blooming to dive into Shinzo's mind, sharing his memories to break Shinzo free of Momo's brainwashing. But Momo's power isn't that easily overcome, locking the two in a stalemate. Meanwhile, the family's two brainiacs, Shion and Nanao, take on Futaba! Will Operation Sibling Retrieval be a success?!.