Okay, lengthy review for the whole series incoming. There will be spoilers.
I've seen a decent amount of discussion of this series online, and it seemed that it was generally viewed as a controversial series either adored or hated. People who hate it have called it horrible representation, and I truly do not think that's the case at all. I think that overall it is a very genuine and empathetic series that takes us on a journey of gender discovery within Japanese society and through the difficulties of junior high and high school.
My main praise for the series is that it portrays a range of experiences of different trans women:
-We follow our protagonist Shuu as she goes through school knowing that she wants to be a girl, but being fairly unable to act on that desire other than by crossdressing for the entertainment of her friends, and sometimes taking the train far enough away that she can spend the day presenting as a girl where she won't run into people she knows.
-Another character, Yuki, is an adult trans women who lives openly as a woman, has a boyfriend and career, "passes" in public, still talks to her mother, and seems generally very happy with her life.
-A side character near the end of the series named Ebina is an older trans woman that Shuu meets while out and about. This character is still living as a man and as a single father. Ebina's mother is very active in her life, encouraging her to remarry and helping to raise her daughter. This familial presence especially limits Ebina's ability to explore her gender socially, leaving her limited to the occasional outing wearing womens' clothing. During these outings, she does not "pass" and strangers make comments towards her appearance as well as the presence of her young daughter.
-Mako, a close friend of Shuu's, is also a trans girl. The difference between the two of them is that as a tween, Mako is less "cute" and "naturally girlish" in appearance to Shuu, and so is not accepted nearly as openly by friends when she expressed that she likes to wear girl's clothes.
Shuu's arc throughout the story contains a lot of moments that felt extremely heartfelt and real. We watch as she gets interested in writing stories as a way to explore her gender identity, handles social situations with friends, crushes, and bullies at school, and wrestles with her body becoming more masculine during puberty. Going into the series fairly blind and aware of the controversial views of the stories quality, I was afraid that Shuu might not decide to transition at all and would become overwhelmingly pushed down by society into living as a man. I was very pleasantly surprised that this was not the case, where in the end she pushes out into the broader trans community in her area, decides to write about her experience as a trans girl (implied to be the manga itself), and tells her girlfriend that she intends to become a girl. (Her girlfriend is supportive of this, commenting that she supposes she is a lesbian then).
Much of the beef surrounding his series online is about its transmasculine rep, so here's my thoughts on that as a transmasc myself. From the beginning of the series Shuu's best friend and narrative counterpart Takatsuki, who is deeply uncomfortable being perceived as a girl and wants to become a boy. The two of them travel by train to hang out together in the clothes they want to be wearing, and I found Takatsuki's experiences extremely relatable as Takatsuki also wrestles with changes from puberty like chest dysphoria and menstruation. It makes sense then, that transmasc fans would be upset that Takatsuki, slowly throughout the course of high school, decides she's comfortable being a girl after all. I am a bit disappointed on a personal level because of course I was rooting for Takatsuki and Shuu to both be able to transition, but I genuinely don't think Takatsuki's change of heart regarding her gender is something that ruins the series. Here's some thoughts on why.
The thesis of this series, reached near the end, is essentially "sometimes people want to be a different gender than what they were born as, and whether or not that turns out to be true, it is okay for them to explore that and they should live authentically as themselves whatever they decide." I think that Shuu and Takatsuki's bond and the ways in which they are similar and different reflect this, and I think its a lovely thesis! Of course its okay to explore your gender and decide that you are cis after all. I think there's even a very poignant moment where Takatsuki feels like she has betrayed Shuu for not being transgender like her, in this experience they though they shared, and has to come to terms with the fact that its okay to changer her mind, and that Shuu is just happy if she is happy to dress and act the way she wants to.
I think that the main thing that would have made Takatsuki's decision not to transition feel more okay to transmasc audiences is if we had encountered other transmasculine characters in the series. While we get a wide range of transfemme characters, Takatsuki is the ONLY transmasc presenting character in the series, so of course its tough that in the end she isn't a trans man after all. But like I said, I do think the series is still of high value and I don't think that Takatsuki's arc is something that is inherently horrible. I think one of the other reasons that I feel this way is that during my study abroad in Japan I was talking to a college student there about my gender and and she told me that when she was in high school she had wanted to be a boy and had dressed as such, but had later changed her mind. While Takatsuki's story might be tough for some trans men to read, it is also just an experience that actual real people sometimes have.
My final note on the series is on the oft-present anime/manga trope of tween characters having an adult friend who acts pervy towards them. Unfortunately near the beginning of the series the author does write multiple scenes where Yuki acts inappropriately towards Shuu and Takatsuki, which sucks ass. This behavior is gone by the end of the series, and it never had to be there in the first place. Obviously its not something you should have to ignore when enjoying a manga and yet here it is. That's probably the main reason this is a 4 star rather than a 5 for me, along with me wishing that Shuu's friends had maybe spoken a bit more positively about the prospect of her transitioning at some point in the narrative rather than mostly just seeing Shuu as a boy who likes to dress girly. Overall tho, I did enjoy the series. Tough read at points, but felt very genuine and full of emotional depth. Impressive, considering that the author's other works contain train wreck premises such as "gay couple wake up one morning to find that one of their bodies has regressed to that of a ten year old".