It has a character editor so solid, so good, so varied, that joking aside, I could use it to test the feasibility of designing anime characters, the character editor is a tool in itself, by itself.
Now... the hentai, it's quite competent, it's too competent I would say, this evaluation will be better left for a degenerate (not me, ahaha), like putting together a harem in this game is a bit repetitive, but that's minutiae.
The story, it sucks, it's very much on par with Hentai that you could watch or read just for laughs, but repetitive as I mentioned.
Install it to degenerately use Free-H, or use it as a character design tool if you're not sure what character to create for a doujin or lewd, those I think are good uses.