* Happy Lesson was conceived as a mixed media project based on Dengeki G's Magazine's reader-participation game illustrated by Sasaki Mutsumi.

When Mitsuki learns that the high school is going to destroy the old school building, she is saddened at the thought of so many memories being erased. Chitose and the rest of the "moms" jump into action to stop the demolition. During their struggle, Fumitsuki, Chitose, and Mitsuki finally understand their true feelings.

Source: ANN

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Prequel: Happy Lesson Advance