Oh this is so cool!!! I love the idea of choosing what your relationship with Laina is at the beginning, and how the story changes so much depending on who Laina is to you. I've love to see more interactive fiction with this mechanic tbh, because it changes the story in really cool ways. (spoilers below)
I love the detail of how you save your sister versus saving your crush. The detail about your sister listening to you and not moving forward, versus your crush, because of how much your sister trusts you, is really cool. I also like that you can't save the acquaintance. It makes sense that you can only survive that encounter if you take your time poking around the church, because you wouldn't really have a reason to worry for/chase after an acquaintance (when the player really only joined Laina for their own interest in this route). Overall, good job! Short and fun game :)