Man. It's just my opinion, but that ending kinda sucked. 5/10 series, I liked the characters, but the story and character development just didn't do it for me.
I really like this set up, especially all the side characters. EVERYONE but Oga knowing that Umeko is trying to go out with him and doing all they can to support her is the best.
I love her so much, she's such a little asshole. She just can't resist the urge to tease people, and it's even better when someone pulls a reversal on her. Whether it be Sasaki with his unawareness, or the manager throwing it back in her face.