Shin Chika Idol

Underground idols. It's a world of darkness so strong that it swallows up the light that idols radiate. There are innocent girls who jump in without even realizing it, and people with a reason who hide their identities and sneak in. Because it's underground, there's also the smell of something dangerous going on. Hanako (15 years old), a streamer who wants to go viral, senses there's something interesting to film and infiltrates the underground idol group "Wonder Festival." But there's something dark about this group...

(Source: Kodansha, translated)