I see a cheating tag but no haram tag, is this one of those game where I have to play multiple times to do the girls one at a time, or does the cheating tag mean I can get with multiple, just not together/them knowing about eachother?
There is sort of a " Soft Harem" but if you are thinking the simple basic every day type of Harem like ALL the girls then no you cannot and will not be able to get all the girls.
You can get with multiple girls depending on the route you take or which of the girls you follow, Best way to figure it out is by not skipping but actually reading and getting to know the girls and make a psychological profile for them.
For example, Katie is bit of a rebel but deep down a broken girl who just wants to get along and get affection from her siblings so she is the type who will be fine with say Her you and Leia, She would also be fine with sharing with Zoey probably if it comes down to that.
Leia is more of wanting to have something with the MC and just the MC alone but depending on how your choices go and if you play your cards right she may end up forgiving Katie and will accept/allow something to happen between the 3 of you, However she is clearly one who will not and does NOT plan on sharing you with anyone else. She will either have an exclusive relationship or non of it, She makes this clear at dinner date. If she cannot have you as a Lover then she will settle for at least having her brother and best friend back.
Zoey is a wild card who you prob down with sharing and flinging but nothing serious unless it comes down to Katie.
Dana is the traditionalist so she does not seem like the type to be about that Sharing life either.
Gina is already in a relationship and her Boyfriend has a Cuck fetish so there is that.
Miru is a wild card and depending on YOUR choices, can either cheat or be down with swinging or sharing.
So it all comes down to and depending on their personality.