I was just an ordinary guy until the day I got summoned to a world of magic and monsters. But here’s the twist: I have the knowledge of someone who lived this life before—a regressor’s memories. Now, I’m the only one who knows the plot twists, the hidden dangers, and the secret paths to power. But knowledge isn’t enough when everyone else has superhuman abilities, armies, and cheat skills. To survive, I’ll need to manipulate, strategize, and outplay everyone—from the strongest warriors to the cunning mages. But it’s not just about beating enemies; it’s about building my own harem of powerful allies, uncovering forbidden techniques, and mastering the martial arts that can reshape reality. Yet with every victory, the darkness within me grows. The line between genius and monster blurs, and my psychological edge might be my downfall. Can a regressor’s manual guarantee success in a world where betrayal is the norm? Or will the lessons of my past lives drive me insane? Step into a tale of action, romance, and twisted strategy where the strongest weapon is a calculated mind. Dive into the Regressor Instruction Manual—your ultimate guide to survival starts now!