I feel like this manga started out really strong, and there was a period of time when it felt like every chapter hit the right points, but then a certain event happened that made me lowkey put it on the backburner (and I'm not referring to the ending)...
Namely, I think the author REALLY mishandled Touma being outed. Like, the reactions of those around him were realistic, but the way the author framed it as if it was understandable to be a homophobe, and that the guy had the right to be disgusted. I was legitimately pissed off, just like the girls in the manga.
And it was also around this time I read the vastly superior Kanojo ni Naritai Kimi to Boku which also had moments like this, but whenever it happened, the author actually treated it with the gravity it deserved, and while it acknowledged that people are going to be ignorant, it never let off those people for the hurt that they caused, even if it was unintentional hurt. ...Unlike what I felt was happening in Blue Flag at the time. (And I still never felt as if the author adequately addressed it here.)
However, after hearing about what happened with the ending, I came back to it, and... Hm, I still don't know how to feel about it. I don't agree that it shouldn't have happened this way (I'm glad it did), but I also wish there had been more buildup. I feel like the author had an ending she wanted to reach, but she didn't know how to reach it, which is why it felt so clumsy.
Also not a fan of what Masumi's husband said about how he didn't feel secure when she's around either women or men (because she's bisexual I suppose? another nitpick: author never uses the word "bisexual"!! ugh). And that he doesn't feel like he "belongs" entirely now that he's dating her, which made me go ??? why is her bisexuality all about you?? But, again, I think this might be more of the fault of the author's framing than anything. Man, this manga... so many little missteps that just add up...
I guess this is just one of those series that I'm just going to feel ambivalent about.