Slave Girl (Novel)

The magic girl swordsman Riley who had defeated the Demon King and was being celebrated as a hero, was transported into another world by a goddess as a savior. Magic was not possible in this world. What’s more, the moment she fell into this world, she was caught by a strange man, and before she realized it, she was already a slave?! Hang on a minute here, goddess! Please give me an explanation~!!