Lv2 kara Cheat datta Motoyuusha Kouho no Mattari Isekai Life EP10 - A New Housemate

Gholl's younger brother, Yuigarde, has staged an insurrection. At his castle, Gholl learns that even the Infernal Four are dissatisfied with his recent actions, and Yuigarde challenges him to a duel with the Dark One's throne on the line.