Survival Manual for Middle Ages in the Magical Girl World

When I wake up, the world has not changed, but the setting has changed. There was a high wall outside the window, colleagues started chatting about magical girls, and monster invasion announcements were scrolling on the news. Lu Mo, thirty years old, is a social beast with no system, no panel, and no beautiful girl falling from the sky. There is only a belly full of doubts, a cup of cool tea, and a self that doesn't know if it is still me or not. He has to survive in this world that looks familiar, but actually everything is wrong. Then find out- Who was he before that nap?