During a routine training session at U.A., a mysterious portal absorbed the students of Class 1-A. Upon waking up, they find themselves in a dark and gloomy forest, surrounded by an unsettling scent of blood and completely devoid of technology. They have fallen into Japan's Taisho era, a world where demons lurk in the shadows and the Demon Slayer Corps fight to the death to protect humanity.
With no pro heroes or Quirk laws to protect them, the students must master this lethal ecosystem, collaborate with the Demon Slayers, avoid being eaten, and find their way back home.
