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

A chuunibyou girl calling herself the "Nightmare of Calamity"—also known as Mea. She was once Kurusu Reiou's former troublemaking friend. They spent precious time together, taking pictures of her, uploading them to social media, and making them go viral, even though Rei didn't even know her real nam