Record of Ragnarok manga volume 17 features story by Shinya Umemura and Takumi Fukui and art by Azychika.

Going into round eight of Ragnarok, humanity is unbelievably in the lead with four wins! The gods are outraged - how could this be happening? In order to extend that lead, Brunnhilde summons one of humanity's greatest scientists, Nikola Tesla, to bring his scientific genius into the Valhalla arena. With no more room for underestimating their opponents, the gods will be represented in the next round by the most sinister of all their fighters, Beelzebub, the Lord of the Flies, also known as... Satan.