Happy☆Lesson: The Final

Mitsuki is upset when she finds out the school plans to tear down the old building, erasing memories that are dear to her. Chitose and the other mothers form a plan to save the building, but in the process, key characters like Fumitsuki, Chitose, and Mitsuki confront and accept their true feelings. The old school building holds sentimental value to many students and staff, making the impending demolition a contentious issue.