Some good discussions going on here, although I pretty much agree with everything UranusAndNeptuneAreJ said. I like citrus, I like the characters (especially Matsuri) but the way things are set up now is just a little too out of left field. I mean hell, something like making the teacher fiance guy show up at some point to the cafe Yuzu was working at would have worked, like he lost a potential candidate or he's being set up again with another student and doesn't want to this time. Idk it doesn't make sense, but it could have given us some more details on how all this marriage stuff works before dropping the bomb and leaving us with no evidence to really base theories on.
That said, does anyone else think Mei being targeted yet again is just plain old boring at this point? Would it have killed Saburouta to make Yuzu the target this time and maybe get Mei to kick herself in gear and confess or take charge to get her back/fight the school? Honestly I think this would have worked a lot better to develop Mei's character and get her to be more open with Yuzu about what's going on in her head. Sure it doesn't really make sense since Yuzu is an Aihara by marriage, but damn, if you're gonna throw curve balls might as well go all the way.
Or who knows.... maybe Yuzu IS the target and Mei's hesitation is from seeing Yuzu try so hard for their relationship but she knows Yuzu is already set up with someone... guess we'll have to wait and see.