in that 3 side routes, the sharing is evitable? I dont care the 'harem' ending or the true ending haha
It's always the same ending. You only have two choices in the game:
The first whether you want to massage the Gyaru daughter or the other one at the beach which changes the scene slightly, and the second choice is whether you want to call up the mother, older daughter or younger daughter for another sex scene.
No matter who you pick the scenes afterwards play out exactly the same, and the ending stays the same. It's barely even really an ending. The actual endings are in the DLCs. POISON really did not make a good choice with how they structured this release. Deliberately cutting out the 3 character endings as well as the harem ending from the main game and selling them as seperate DLCs is a borderline scam.
On top of that they couldn't even bother to do the bare minimum concerning the quality of the "translation". It's just straight up DeepL with no QA behind it, there are a few untranslated lines left in Japanese, and the name of the MC is spelled "kyouji" in his textboxes every time while every other character has their name with a proper capital letter (Arisa, Manatsu, etc).
With this little effort they shouldn't be surprised if their "English" version tanks in sales. They should have contacted someone like Mangagamer if they wanted to properly cater to the English market. Which would also come with the added benefit of uncensored releases. Their games have decent quality sex scenes, but this shoddy attempt of releasing them outside of Japan makes them so much worse than they could be. It's pretty sad.