Josou Sennen Oukoku

A hero is summoned to a fantasy world and defeats the demon king to restore peace. Rather than being sent home as promised, he discovers that forging a lasting peace treaty between humans and demons is his true task. Three powerful figures—a cross-dressing princess knight, a former demon lord now serving as a succubus emissary, and an inviolable saintess—each have their own agenda and seek to secure the hero's loyalty and power for their respective purposes. Set in a peaceful kingdom now populated predominantly by feminine-presenting men, the hero must navigate political intrigue, supernatural temptation, and conflicting loyalties as each character pursues their own strategic goals.