Read this on an other site. Leave a thought on the forum on how it would play out.
I left the really bad ending.
The son loosen it. He starts ntr the other wives. So he can destroy his father and hurt her. Then attacks the 5th wife and she ends up killing herself. The father will then be broken and descend into a world of drink and drugs.
Now after reading some of the author other works, I don't think it will be as bad as that.
Also someone on that forum said there is only 3 chapters in the raw manga.(Sorry it is 3 vol.)
Also it looks like it original came out in the 90s.