This is the 15th year anniversary of the beginning of the school year. Aco Momota introduces us to her new friend, matsuri, who has just returned from a trip to Europe. She's excited to be back home, and she invites her friends to go on a field trip to celebrate the new year with her. The two girls agree to go, and they're psyched to see each other again. They're both in different classes at school, but they still get along very well.