Redo: Clearing this Isekai with unlimited retries

A time-loop/regression story It was the start of a brand new school year before he and his classmates were transported to another world. A world of swords and magic, yet it isn't the kind of world that's forgiving. With death lurking in most dungeons, the evil side of humanity, and deadly magic that cannot be explained at times. What a more perfect world to have some sort of redo ability right? ... Author here, wanted to make my own story and start writing after some thought, reading all these regression and time-loop stories made me want to create my own too. Although not quite original, I wanted to also express my own creativity for fun. May not be completing this story and dropping it, but who knows how far I'll take it? Let's see. Ps. The picture for the novel cover is not mine, and will probably change it. Though this one hits the gritty feel for me.