you could read them by visiting the chapter you desire, copy the website link and visit archive.org and paste it there. Every chapter are actually saved and you'll read them there. Hope this will help :D I am conscious that we don't have the writer's permission like Guro does, http://english-novel65048.arwebo.com/17122220/5-essential-elements-for-tensei-shitara-slime-datta-ken-light-novel