VN and seems pretty netorase
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The plot goes like this:
The protagonist is in love with Airi (the heroine) because she is beautiful,kind and refined. But one day when he goes back to the tennis club to get something he forgot finds Airi having sex with one of the members of the club.
The next day he asks both the member and Airi if they are dating both denied this so he thinks the sex he saw was his imagination,soon after the tennis club go to get drinks,and after the party Airi starts touching two club members,the protagonist sees this and follows them to the club room and finds Airi having sex with the two guys.
The protagonist then has two options...forget her or confessing.
If he forgets then he asks the guys to take him with them to have sex with Airi...and starts having group sex with him and 3 more guys...and she is insatiable...the game ends with the protagonist forming part of Airi's sex friends.
If he confesses he realizes that he can't satisfy Airi alone so he has two options again...let her have sex with all the men she wants...or trying to sastisfy her by himself.
If he chooses to let her have sex with other guys she will keep fucking the entire tennis club with her new boyfriends blessing (also the majority of the sex scenes are from this route) they do make it work and have a pretty stable relationship...knowing that Airi is screwing like 30 guys including him but she doesn't get stolen.
If he chooses to satisfy her by himself...he will have a pretty rough time keeping up with her lust...but all the tennis club members help the protagonist by giving him advice of how to satisfy her...and he WILL achieve this thanks to the advice taking Airi all to himself.
So yeah is not really Netorare...unless you count the protagonist stealing the girl from all the guys who fuck her in the true love route.