The formula of this manga isn't something I'm necessarily opposed to. Slow-burning romance with chapters focusing on different side characters can be very effective. There are just a couple of problems with this:
- The side characters are poorly fleshed-out to the point that their existence feels totally tangential to the main romance. They have their little side story and then become complete satellite characters, only useful to the plot inasmuch as they consult the main two characters. It makes them feel like cardboard cutouts more than human beings. What can I say about the asexual teacher as a character other than the fact that he's asexual? Bloom Into You, in contrast, has a cast that keeps growing and has their own experiences outside of their relevance to the main romance.
- Tied into the first issue, the way that information is conveyed feels very after school special. The characters' side stories feel like the author is saying, "look at this type of person. It turns out that they're actually people! I bet you've never thought about THIS before!" Again, their potential to be interesting characters is sidelined in favor of their use as tools to advance the plot. For instance, the story could weave a side plot about Yukka coming to term with her feelings, but we haven't really had any advancement with her since her chapter.
- The reasons the characters give for their actions are very contrived. I don't expect teenage characters in romance manga to act rationally, but we don't have time to see for instance that Akira's feelings for Hasegawa were just her projecting her idea of what a girl "should be." We are told more than shown the ways that the characters feel; there's not enough buildup to these huge emotional moments. It feels like the author has a plan of how this is going to progress, and it just sort of progresses mechanically from plot point to plot point.
Overall this has a lot of potential and I love stories about trans characters, especially romance between trans lesbians and cis lesbians (since I'm dating a trans woman lol), but I just don't have any patience for this anymore. Even My Unrequited Love, which is a bit melodramatic at times, still doesn't make me sigh in exasperation as much as this manga.