Synopsis: Regressor instructional manual

He was suddenly summoned to another world one day.Monsters poured out, a huge disaster incoming.His ability the lowest.[Player's level is low][Your level is hopeless]It doesn't matter whether you're the chosen warrior, a talented wizard, or someone who travelled back in time. One must do everything they can,in order to survive.The Regressor's Instruction Manual."It doesn't matter if I'm trash." Is there anyone who wouldn't do anything they could to survive?