In a world where portals full of magical creatures started appearing, professional killers are needed - hunters. Seigaiha, a girl who works as a hunter, encountered an unusual occurrence that will change her life forever. Seconds before she runs out of breathe a message popped in front of her. Do you want to be a player? Within 60 seconds your heart will stop beating. ACCEPT DECLINE With death right in front of her, she didn't think twice and accepted the offer. Will she regret this decision?