On his first day at an all-boys school, Tooru Kouno finds himself subject to unexpected attention due to his attractive appearance. Moreover, having to switch to a school without girls is already frustrating, and the boys staring at him intensify the feeling. Nonetheless, he holds out hope that girls exist, as he'd encountered a fair-haired beauty on campus that day. His classmate, Yuujirou Shihoudani, escorts him to his dorm, where Tooru meets Mikoto Yutaka, a student who bears a striking resemblance to the pink-haired girl. To his surprise, he discovers that Mikoto is the girl he saw and confronts him. Tooru learns that Yuujirou and Mikoto participate in a school custom that involves cross-dressing as first-year "Princesses," chosen to boost morale among students. Tooru, thanks to his looks, has been selected as the student council's third Princess!