A good, sweet ending to one of the better romance series I have seen lately.
What I think this final episode reinforces most is how much stronger Fumi gets every day. Sure, she has a relapse of feelings for Sugimoto (a perfectly understandable, human moment), but she does not wallow in despair about it like she might have done at the beginning of the series. Instead, Fumi talks it out with Acchan and moves forward a bit. And when Fumi sees Acchan and Kou in the store together, although she completely misunderstands the situation at first (without knowing why), she does not make a big stink about it or get overly emotional and awkward (aside from a bit of jealousy on her part). Instead, she lets things play out, has fun with Acchan and her friends and then everything is cleared up later when Ikumi texts Acchan. Fumi is even able to have a good laugh at how ridiculous she acted! Speaking of, she even smiles and talks openly with her friends in the opening montage! Fumi may still be a bit stilted at times, but she has grown so much comfortable with everything around her.