I Can See the Future of the Death of Magical Girls

Twenty years after defeating the Calamity Monster King, the world is at peace and magical girls have become an industry. Ange is currently a student in the logistics department of a magical girl academy. Her goal in life was to eat well and wait until death. One day, he accidentally got two things. One was a magical lantern, which allowed him to see the future where the magical girl was killed by the devil. Not only that, he can also use the lantern to enter the other world and see the true form of the devil that is invisible to everyone. More importantly, he got another thing, a knife. That knife can engulf the demonic being and use it for him. After some time, he came to a conclusion. He became the only one who could kill the demon. "What else are you talking about? Let's forget about ordinary life. I want to kill demons, save magical girls, and usher in a super exciting love harem story!"