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.

Mutsumi and Taiyo are invited to a Hinagiku hot pot event to celebrate the success of their latest mission. Surrounded by a lineup of scoundrels, will the two actually be able to finish the meal safe and sound? Plus, there's still the mystery of the box that Kuroyuri gave to Taiyo looming overhead-and what's with this new girl latching on to Taiyo? Could it really be that he's cheating on his beloved Mutsumi?!