Initially a girls-only school, Ousai Academy eventually transitioned to a co-ed institution due to falling birth rates. Tsuda Takatoshi, a male freshman, found himself in unfamiliar territory as he entered a school full of female classmates. On his first day, Tsuda's unfortunate encounter with the student council president, Shino Amakusa, left a bad taste in his mouth. While being reprimanded by Shino, Tsuda met the rest of the student council members and ultimately ended up tardy for his first class. To make amends for the mishap, Shino extended an invitation for Tsuda to join the student council, which he reluctantly accepted. Through this experience, Tsuda quickly learned that he was the only "normal" student at Ousai Academy, setting the stage for his journey in the school.