Uchi no Seiso-kei Iinchou ga Katsute Chuunibyou Idol Datta Koto wo Ore Dake ga Shitteiru.Uchi no Seiso-kei Iinchou ga Katsute Chuunibyou Idol datta Koto wo Ore Dake ga Shitteiru.; 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。; Uchi no Seiso-kei Iinchou ga Katsute Chuunibyou Idol datta Koto o Ore Dake ga Shitteiru.; Only I Know That Our Innocent Class President Was Once a Chuunibyou Idol.; Chỉ mình tôi biết rằng cô lớp trưởng thanh lịch của lớp tôi từng là một Idol Chuunibyou

The once-famous chuunibyou idol Nightmare Disasternicknamed Meahad 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!?