Anata wa Akumu no Sankasha ni Erabaremashita.

Hint: Please give it your all, as if you are prepared to throw your life away. Once you see this dream, you will never wake up—the curtain rises on a "Nightmare" game that never ends.

"The participants for the Nightmare Game have all assembled." Haruto, an ordinary high school student, wakes up to find himself trapped inside a nightmare. An eerie announcement echoes through the building: if he cannot escape this unfamiliar shopping mall by dawn, he will experience a physical agony more terrifying than death. While Haruto is still half-doubting the reality of the situation, a blood-stained pursuer appears before him. To survive this irrational nightmare alongside the eight other participants present, he must find...