Surreal Academy

That was not a dream, but a real event. To be precise, it should be an event that happened in your world. A certain person fell into madness due to a certain situation. After losing his mind, he destroyed the entire world. To explain, the definition of "world" in the words does not just refer to the earth, but refers to the universe. All humanoid life and all objects with consciousness have been reduced to nothingness. He regained his sanity and returned the universe to the way it was before it was destroyed by him. In your time, it may be wrong to describe it as once, but for me who retains this memory, once is correct. And now that he has founded this academy, you are a candidate for official studentship!