"At the strike of midnight, a random person meets a man in their dreams. The man would give them a deal - win his game and gain an unthinkable power, or lose his game and forget that meeting ever happened."

While the inoffensive high schooler Jin Yamaoka doesn't believe in this myth, he's taken by surprise when he wakes up in his dream and meets the very man one night. With a stroke of luck, he succeeds in beating the game, only to find out the true story behind his new powers - every night at midnight, peoples' nightmares materialise and attempt to kill those who dream of them.

With a new power in his hands and the fate of the people of the world on his shoulders, Jin has no choice but to attempt to become a hero, while still wearing the identity of an innocent student.