Welp, they've got a month. Saeko should have that random coworker divine their future. BTW, were Miwa and Saeko's surnames ever previously mentioned?
This might be my favorite chapter so far. The shame Saeko feels in trying to be vulnerable is terribly relatable. Especially the separate-self thing. If they break up, I hope they come out better equipped to communicate with their future partners, and not just more emotionally scarred.
If Miwa discovers that her former senpai likes girls and/or is dating someone, I can imagine that would spark some regret, though I'm pretty sure she wouldn't cheat. But, if Saeko ends up freaking out about the event, she could end up losing Miwa's trust.