I was the ''just wants to be done with high school and move on to a better stage of my life'' type and that's a pretty strong motivation to pass your exams, let me tell you ! I don't know what letter that is (^^)
That's a gremlin smile if I ever saw one at the end! Lets hope she's the fun type and not the mean type ! Midori means green, so the author is keeping with her color has to be in the name formula.
I don't think this means VE is ending anytime soon FWIW, it's just that this specific couple is getting their conclusion now. We've seen other couples get their official ''send off'' in the past.