Now that the game is getting big, I'll show you how to unlock every CG illustration of the game. This is valid for the latest build of the game which you can get HERE.
COMMON ROUTE
The first 4 choices doesn't affect the outcome (for now):
Peek/Don't peek inside
Check/Don't check Phone
Confront/Let Old-Man Watch
Call/Don't call
FIRST STORY BRANCH
Stay Here: Leads to the "Wholesome Route"
Go Home: Leads to the "Darker Route"

1) WHOLESOME ROUTE
Choose "Stay Here"
1A) HANA END Finished
Choose "Leave Yuma"
Note: This storyline will be continued on the sequel, Indecent Wife Hana: Gravure. Please Wishlist it.
1B) LOVE END Finished
Choose "Keep Yuma"
It will unlock after completing "Hana END".
2) DARKER ROUTE
Choose "Go Home". It will unlock after you complete the other endings.
Choose "Spy on Hana"
Choosing "Don't Spy on Hana" will return you to the wholesome route.
2A) LUST END Finished
Choose "Keep Watching"
2B) END TBA To be continued in future updates
Choose "Make Yourself Noticed"
2C) TATSUKI END Finished
Choose "Go Away"
3) ONSEN ROUTE
Choose "Suggest the Onsen".

3A) HONEYMOON END Finished
Choose "Don't Go Back to the Onsen"
Latest content as v0.42.
3B) ONSEN REVENGE *To be continued in the Sequel*
Choose "Go Back to the Onsen"
More info here.
You can open the flow chart in-game!
Press the 'y' key or the FLOW button to open the scene selector where you can open the flow chart.

The routes are color coded and numbered so you can have a better idea of where you are.
You can even click on the "coming soon" blocks so you can play those games as well.

Q: How do I unlock the "Stay Here" choice?
A: By getting the "HANA END" and "LOVE END" first.
Q: How do I check my progress?
A: If you have the EXTRAS PATCH, you can check your progress on the galleries.
Q: How do I advance quickly?
A: Right clicking (PC) or long-pressing (android) the SKIP button will jump to the next choice.
If you have the EXTRAS PATCH, press 'y' to select any scene in-game.
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