Muzan Is My Wife

The protagonist is suppressed by a divine being, and the first three chapters are utterly ridiculous. The characters are immature and eccentric, the background is absurd, and the story is bizarre. This book is now complete. #(Blue and sad) Shennong tasted it for you all.

Let him release this kind of pure repression that he was able to write!

Honestly, the Demon Slayer universe itself isn't that bad. The protagonist could even stay completely unchanged, just focus on their romance, and then watch as the demons are wiped out, with Shisuna going to Hell to continue their lovey-dovey relationship. After all, in a world with Heaven, Hell, and reincarnation, nothing else really matters (you know what I mean). The later appearance of Faker was a bit of a jarring addition; I'd much rather see the protagonist's daily interactions with the Upper Moons and Pillars. At worst, they could recreate the Infinity Castle, have a big fight, and then visit each other between Hell and Heaven. Whoever wants to live can reincarnate and have some fun.

Puppy love