This is a masterpiece, a magnum opus, a chef d'oeuvre. It isn't just your typical DxD fanfic with issei bashing and no plot. It is a perfect blend of amazing ideas from technological to weapons of mass destruction. The way Dragon manages to make up all of these weapons and machinery and then explains how it exactly work AND make sense is just perfect. And also the future smuts are just god tier. I won't be going more into details as that will spoil a lot but I really suggest you come join the Discord server and read the advanced chapters. You can also discuss the fics with us!
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LIKEvillain novels -> novelexpert.com/list/villain-novels . go check that out if you like harem and like the type of MC with a scheming character and an alpha along with a nice plot development of destroying those naive protagonists and sons of luck and getting the heroines before them 😉