how is the swinging on this game? not really one of my favourite genres
This is not a harem game. This game aims for realistic relationships.
The MC becomes part of a scouting group, which includes both guys and girls. The girls have quite distinct personalities and personal situations. Your choices determine your position towards each of the girls, which means that you will need to choose which girl to pursue and which not.
The girls are quite varied.
Some are already in a relationship (with guys who are also part of your scouting group) but are willing to get involved with the MC as well. Some might (pure speculation on my part) at some point decide to ditch their present boyfriend and go for the MC exclusively instead.
If you don't like any of that, there is also at least one virgin girl with whom I assume you can have a fully wholesome relationship with.
So if you are not into swinging, this game can be very good for you, you just need to take care which girl to pursue and which to leave alone. It's kind of like being back in high school.