Reincarnation. It's a nice thing. You get to live your next life with or without your past life memories. In some cases you get strong and other cases weak. Some may have a good next life and some may have a bad next life. In my case, I got reincarnated into a dangerous fictional world with my past life memories. (I do not own anything I use in this story. WARNING: Grammar, slow update, and spoilers if you don't read the manga!)