Ignore the tags, only the system one is real, there is no harem, yaoi, weak mc, ntr, or (at least to my knowledge) any plagiarism.
This is a world designed solely by the author, and all the characters (well, those that matter) are likable; the grammar is rarely incorrect and the story is quite enjoyable.
Those tags are just fake and leave me wondering who wastes their time vandalising someone else's hard work
