Climbing the Tower that Even the Regressor Couldn’t

Synopsis

During a drinking session, a friend of mine suddenly made a peculiar statement. He claimed to have gone back to the past and referred to himself as a "regressor". He also mentioned that I was the only hope left for humanity. Despite my skepticism, I ended up being dragged into a Tower, where I will face various challenges and trials. Regardless of what lies ahead, I am determined to conquer this tower.