Lion, a princess from a small country, has enrolled in Pirari Academy in Hokkaido. She was looking forward to starting her fun new school life with Nina, the girl she admires most, but something is amiss.

After just one night at the academy, Lion finds tests waiting for her in the morning, and is disheartened after some very disappointing grades. She cheers up after talking with Yuko and the student council while eating Yuko's homemade cookies.

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 suggests having a pajama party.

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 active dute Logicalists.

Its 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.

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?