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 the only loophole hidden within the rules—but will he succeed?

You have been chosen as a participant in the nightmare. Now, please give it your all... as if you truly intend to throw your life away.

(Source: GA Bunko, translated)

Note: Winner of the Silver Prize at the 17th GA Bunko Awards.