Guide to the Regressor

"One day, I was summoned to another world. Beasts are pouring in, and an unbelievable crisis is approaching. The talent I possess is at rock bottom. [The player's talent level is the lowest.] [Almost all stats are despairingly low.] Whether it's the chosen hero or the talented wizards. Even the time-reversing returnees. I must use everything at my disposal. To survive. Returnee's User Manual 'So what if I'm trash? I'll do whatever it takes to survive!'"