Romance! A crazy, overprotective brother! And...spies?!

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!

Hifumi's concern for her twin brother Alpha's safety triggers her Blooming. Her Uncle Kyoichiro sees her power running amok and steps in to stop it, but Hifumi won't let up! Meanwhile, back at Teiou Academy, Alpha's in bed with a fever. Shinzo and the others are doing their best to tend to him, but nothing's simple in a house full of crazy siblings!