Uchi no Seiso-kei Iinchou ga Katsute Chuunibyou Idol Datta Koto wo Ore Dake ga Shitteiru.

A girl who once called herself the "Nightmare of Calamity," known as Mea, was a mischievous childhood friend of Kurusu Reiou. They shared time together, taking and sharing photos of her online, which became popular despite Reiou not knowing her real name. Mea was later discovered by an agency and moved away to pursue a career in entertainment, debuting as a chuunibyou idol. After entering high school, Reiou learned that the class president, Juunaya Nagi, was actually Mea, who had since stopped acting chuunibyou. Due to specific reasons, she had to become student council president as a first-year student. Now, Nagi is shy and socially awkward. Reiou resumes a producer-like role to support her.