This Paladin Is the Demon King

The devil descended from the sky to the small village, and the panicked villagers sacrificed a poor orphan girl to the devil as usual. The devil spared the villagers, and on this day every year, the villagers sacrificed a girl to the devil. Until one day, a warrior wanted to end the dark rule of the Demon King and sneaked into the Demon King's Castle to assassinate the Demon King. However, he found that the castle was like a beautiful paradise. All the girls were not eaten and lived happily in the castle.