Yeah Hana and Mina are pretty much the saving graces of this game if you ask me. Though i might just keep playing if only to see Kathleen gets fucked in a figurative sense.I'm going to guess you're still in the prologue (specifically the Greek yogurt part), before all the Carnations are revealed. It does gets a lot tamer in some aspects after that, when you gradually get Mina and Hana to balance out the skeeviness, but the story is still centered around an unsavory and exploitative setting.
I would say keep playing and give it a chance, but out of respect for your time, it might also just not be your sort of story.