うちの清楚系委員長がかつて中二病アイドルだったことを俺だけが知っている。

Synopsis

The once-famous chuunibyou idol "Nightmare of Calamity"—nicknamed Mea—had taken the world by storm. Reo, who used to take photos with her and post them online to make them go viral, unexpectedly reunites with her at his new high school. However, she has already graduated from her chuunibyou phase and now goes by Kanagi Nagi, the socially awkward, introverted class representative! On top of that, due to certain circumstances, Nagi is aiming to become student council president and asks Reo for help, pulling him back into producing her once again...!?