While looking at https://www.mangaupdates.com/series/9zcfajt/, I noticed 3 particular tags: "grooming", "pedophilia", and "pedophile". None of those tags apply to the story. It's very light on romance in the first place and has nothing remotely close to "grooming".

Doing a search for those 3 tags with "hentai" disabled gives about 2 pages of results. I haven't read all of the results, but I'm pretty sure a lot of these do not deserve any of those tags.

I'm guessing it was added to Fushi no Kami because the protagonist is reincarnated in another world, and therefore a single user added the tags because the main character is an "adult" while the love interest is a child, and did so for several stories. That's the charitable explanation - they could just be a troll. If these tags were added in bulk by a single user, could they be removed?

Tags removed

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A just ruler amongst tyrants