Defeat The Kingdom

I am the Demon King who will defeat many countries.And took beautiful girls to make me slaves.This is Ruby, a quiet girl who rarely speaks, but she is the best knight in the kingdom. She is also number 1 for kingdom missions.Ruby is 16 years old. Even though it's still easy, he's already good at fighting.This is Aoi, she is a girl who is angry and easily angered, but she is the most feared knight of the church.Aoi is 19 years old but Aoi is Ruby's rival for everything.This is Silvy. She is a great fighter in the Fighters Guild.silvy is a cheerful and enthusiastic girl.and many more girls to be my slaves