Uhhh, I think there isn't a harem ending, but I didn't try.
Pretty sure you only get the good ending with the blonde wife if you don't cheat on her.
You can try and see if it still triggers the happy ending if you do all of them.
Either way, the game is pretty stacked against you winning. Even on very easy mode.
The ritual at the end almost makes sure you lose.
I'd suggest using a cheat engine speedhack on the ending ritual, and using the auto-win against the old fishing guy.
No point in playing the higher difficulties, unless you want to unlock cosmetics for her standing figure. (Doesn't work in sex scenes.)
If you're looking for a decent vanilla or harem story, its probably better to just skip this game, and go find another one.
Just use the gallery unlocker for this game, enjoy the animations, then move on I say.
This game isn't a chad thundercock harem fantasy. Its mainly a NTR game with tribal black guys stealing your wife, and the vanilla route is pretty short and difficult.
Not to say the game is bad, the animation is good, but the story seems to be merely a second thought.
Like the developer's name represents... "NTRMAN" vanilla is a second thought in his games. Short optional route, where most scenes/content are non-vanilla.
I was merely fascinated in seeing what a vanilla route by a dev called "NTRMAN" is like, but now that I'm done, I'll be heading out.
No offense to anyone who is into this kind of stuff, of course. They're free to like what they want. Just fiction anyway.