I’m curious as if, if a year had really gone by and by that time some senpai started getting close to Kana and maybe Kana started to consider that her feelings for Yuki were faltering, would Yuki do something about it?

It was kinda hard to understand who was saying what at some points

Same. At the it's hard to say who's saying what. Like "make sure you think about me all the time" who said it?

But anyway... idk if she doesn't feel the same way why making her wait 1 year? Does she wants to make sure whether her like is the same or not? It would be like time wasted if in the end they go separate ways