**This story has spoilers so be sure you are finished on Lesson 20** ** This also includes Nsfw ** 1) MC was trapped inside the Demon Lord's Castle, Locked away inside the prince's bedroom for all eternity, Hold by the future king of Devildom of being obsessed with a humbled human who was an Exchange student to R.A.D Now Cornered within the Royalty's walls forever (?) 2) Coming soon