Thirteen champions of humanity face thirteen gods in single combat, one bout at a time, with the survival of the human race staked on the outcome. Brunhilde and her fellow Valkyries continue overseeing the death match they set in motion, pairing each fighter against a foe drawn from mythologies spanning the ancient world. This fourth season continues the Ragnarok tournament from where the previous season's matches left off, with its next pairing of god and human champion still to be revealed.