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! 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 Mission: Sibling Retrieval be a success?!