I hate to give this to Mandarin Farm, but I can only give Busty Idol Manor 2 1/2 stars (rounded to 3 for how rare these bust sizes are in games).
Contrary to this game's title, there are no idols nor a manor. Instead the game focuses on small story snippets acting as excuses for the four women (plus a futanari, demon, and bonus gender-swapped husband) to whore themselves in a brothel in exchange for granting their wishes.
The stories are dingy: ~3 minutes worth of reading the sad backstories, ~2 hours going through the sex scenes, then ~10 second epilogues.
The idol costumes are just something to unlock a couple extra sex scenes; the main character (purple dress, black hair) also has a maid and slave outfit for more scenes.
The biggest problem in the game is that you are not supposed to enjoy the sex scenes: you must keep the characters' lewdity below 100 (increased via sex) before they collect 200 ml of semen. This means that repeating a scene you enjoy before clearing the game could lead to the "bad ending" cutscene.
I recommend just grabbing a completed save file to unlock the gallery function. It's fundamentally the same experience.