Kisara Yamashiro is a freshman at Harusaku All Girls Academy. On her first day at the academy, she gets lost and nobody wants to help her. She ends up in an empty classroom and sees a beautiful older girl, reading a book. Her name is Yuri Sasaki, a third year student. Without hesitation, Yuri helps Kisara to find the right way. Kisara is fascinated by Yuri's appearance and starts to develop feelings for her. But Kisara isn't alone, Yuri is actually very famous and popular at the academy and a lot of girls have a crush on her. One day, Kisara is brave enough to write Yuri a love letter but gets disturbed by a spectacled girl. She is Miya Odagiri, Yuri's classmate and leader of the Yuri Admiration Society. A secret club full of girls who are in love with Yuri and protect her against danger. Kisara decides to join the club to protect her beloved senpai.