Until ch.16? Wow. Amazing take on DXD. Fresh, original, plot, with a great storytelling and everything. Chapter 16 is when all goes down-hill, or rather, fall from the cliff [SPOILER ALERT] when the character revealed to be issei :/ choose to be a devil -.- enter the usual plot-line :x and just a complete loss of what was till that moment. I still tried to keep on reading, but it was rly bad. Wish you re-edit, re-think, by using the fresh start you had, and instead of going issei-route you'll continue the unique take you had in the start.
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LIKEYeah frankly I'm not good with the PLOT, but I wanted to give the MC the Red Dragon Emperor sacred gear powers and I was inspired by another fic I read once... However, and here is the good news for you and all my readers starting from chapter 42, exactly (The Second Arc: The Red Dragon Emperor’s Wives) The Mc's will demonstrate his conquest going for other women... I don't wanna say more I'll let you find out.
I'm feeling the prob is unsolvable for the certain ff (because any change will make the park pre/post ch.16 incoherent). If I need to explain farther, it's: (1) the personality change that flipped. If the MC was a growing playboy, going from passive to passive-aggressive, reaching a great personality equilibrium.. but then went full aggressive.. :/ (2) The teasing about power turned to be the same old red-dragon, where it's your ff, you can imagine whatever, free to invent your unique ideas [or even leave it as a mystery? I don't know. I guess the ff of 'It started with artifacts' about salomon-dxd raised my bar high], but it collide with the known plot-worldview who existed, so it hard to immerse in the old trope of red-dragon as now a unique take of it?; (3) Turning into a devil, aka a servant, goes against the paradigm. imo, making MC a dragon-bloodline instead has a much deeper allure (maybe even turning him into sort of yokai by it?), which we know dragons are at the top of dxd, and it's easy to develop uniqueness there; ty for reading my comments. You're a great author to rethink and answer your readers. shows a will power to progress and accept/confront the readers-imagination-pov. Wish you keep on your way.