Subway Knight Chronicles

After the last train of Line 11 every day, there is one more. No one knows when it arrives. Those who mistakenly board it can never return to their former lives. In the carriage, ability and cost are equivalent—what you have lost, you can gain. The cost is: kill others, or be killed. And the monsters wandering in the carriage were once human. They couldn't hold on, so they changed. After 11 PM every night, Line 11 is there. Waiting for you to board.