As the Devil King's Army fights the Iron Scorpions, Satan challenges Alciel to a one-on one duel! Maou's made it this far relying on trickery and clever schemes, but can he demonstrate the personal strength needed to force the enemy leader to bend the knee? And that's not the only headache he has managing this team of demons, as Lucifer stages a rebellion that puts the Maou's forces in imminent danger of collapse!