In a world where monsters have been farmed to extinction for XP, twelve people with unique RPG classes board a train; among these twelve people, the last monster is hiding. Some passengers are oblivious victims, while others boarded this train with a plan already in motion.

In a world where monsters have been farmed to extinction for XP, twelve people with unique RPG classes board a train; among these twelve people, the last monster is hiding. Some passengers are oblivious victims, while others boarded this train with a plan already in motion.