Sometimes being the villain is way more fun than being the hero.

Mamori Wataya has always faded into the shadows at her school. Tall and plain, she long ago accepted her role as a side character. When she befriends Soushi Fuji, her brusque classmate who walks with a cane and gets even when people underestimate him, a new avenue appears before her. Can Fuji teach her to embrace her bad side and become a villain like him?

Fuji has ordered Mamori to go on a date with his younger brother Koichi, lovingly nicknamed "the Prince" by all his admirers. And although Fuji hopes to mess with his brother’s head, Koichi has his own ulterior motives for Mamori that quickly turn the date into a nightmare. Just when Mamori thinks things can’t get any worse, a young woman named Ichika appears, claiming to be Fuji’s fiancée…