Lion is a princess from a small country who has enrolled in Pirari Academy which is in Hokkaido. She was looking forward to starting her fun new school life with Nina, the girl she admires most... but something is amiss. Lion seems to be missing something important that she must have to be enrolled in class S.

After just one night at the academy, Lion finds tests waiting for her in the morning. Lion is disheartened after some very disappointing grades. She cheers up after talking with Yuko and all her friends in the student council while eating Yuko's home made cookies. And so she goes to face her first covenant. How will Rosa react to Lion's feelings towards her?

Lion and her friends are enjoying a tea party in Yuko's room when they unexpectedly learn the date of her birthday. What's more, it's today! Yayoi proposes throwing a surprise party for Yuko, and Lion remembers that Yuko once said she wanted to have a pajama party. To buy a birthday present for Yuko, Lion heads to Pirari Town to visit it for her first time.

Class S faces their first practical exam. Yayoi is aiming for first place, and gets even more enthusiastic when she hears the examiners will be Logicalists currently in active duty. However Yayoi's biggest rival, Nina, seems to be more concerned about Lion than her. And so the chaotic practical exam starts. Who will take first place?

It's first year class S's first practical exam. Yayoi intends to take first place, and when she hears Logicalists currently on active duty are going to participate in the practical exam, she puts even more effort into her goal. However, her biggest rival Nina seems to be more concerned about Lion. And so the practical exam starts, filled with ups and downs. Who will get first place?

With the exams over, Lion approaches her first ever summer break. Lion's friends come to her home to enjoy their vacation. What kind of fun memories will Lion create with her first trip with her friends?