Comments of chapter undefined of I Refuse to Become Scumbag in Tokyo

I have enjoyed the story so far, as far as I have read it, but I am a bit confused by the lack of fan-fic tag. I guess it is more a situation where the author has imported characters or more entire casts from some stories but did little with the original story itself. The MC is supposed to be somewhat of an antagonist with his system wanting him to steel all the potential heroines and maybe even some not-heroines(bl) from the protagonist characters. The MC in this story seems to be trying to treat people more as a real person would and not as targets, but still with so much imported from other stories I would think that the fan-fic tag would be required.