Restart with no regrets { Tensai Shitara Slime Datta Kun }

After several years of Great Tenma war a lot has changed and developed in the world but Rimuru was upset sometimes and feeling the regret regarding that he couldn't had saved, Though he is a Supreme of this Multi-Universe. So he want to back to the past and fix those regrets. ( Note : This is a fanfic and I had changed the story somewhat and added some new characters according to it. ) I had read many other fanfic's and inspired from them. So i hope you all enjoy by reading this, I hope you will like it. Am sorry if there is any grammar mistakes because this is my first story am writing. I would like to hear your suggestions so please write down your comments