Mushoku Tensei - Tome 17

THE PRINCESS AND HER KNIGHT Rudeus plunges into the political fray, enacting Orsted's plan to put Ariel on the throne of the Asura Kingdom. Though fortune seems to favor them at first, the crafty Man God has one last card up his sleeve—a dangerous foe they must face before the new monarch can assume her crown. Worse yet, there may be a traitor in their midst!