Eimugai

When high school student Minon’s beloved brother vanishes without a trace, his only farewell is a cryptic email. The message reveals he has been taken hostage by a notorious serial killer known only as "A" and mentions a mysterious location called "Eimugai." Desperate to save him, Minon scours every available resource for information about this place, only to find that it leaves absolutely no digital or physical footprint. Her sole lead is a suspicious building where she last saw her brother alive. Determined to uncover the truth, Minon infiltrates the structure, unaware that she is crossing the threshold into a forbidden domain that was never meant to be entered. What begins as a desperate search-and-rescue mission quickly plunges her into a nightmarish reality. She has unwittingly stepped into the very nest of a profound evil—a realm where the horrors within defy all common sense and human comprehension. Now, trapped in a world governed by madness and malice, Minon must fight to survive and reclaim her brother before the darkness consumes them both.