4 : Idol Dies By Steel Beam Instant

Protagonist Kotoko Iwanaga and police officer Saki Yumihara team up to investigate Karin's past to find a way to defeat the "ghost," which is actually a "monster of imagination" created by the collective will of people on the internet. Where to Watch or Read

The original source is the first volume of the Kyokou Suiri novel series . Episode 4 | Kyokou Suiri Wiki | Fandom 4 : Idol Dies by Steel Beam

The story is covered in the early volumes of the manga, available on Kodansha's K MANGA platform . Protagonist Kotoko Iwanaga and police officer Saki Yumihara