Wonderful, fantastic, beautiful, exciting and surprising were the feelings I had when watching this amazing manga/anime. Yagate Kimi Ni Naru to begin with, cataloging it as Yuri or romance is something superficial because yes, it's about two young girls having love relationships, but it's more about self-discovery, how love manifests itself and self-realization.
The anime begins by introducing us to Yuu and Touko, our 2 main characters. Yuu is a girl with "the inability to love" coming even when someone confesses to her she feels absolutely nothing, but has a personality that always seeks to help others but hides it under "normal and logic", at the same time she also does not have many hobbies.
In contrast there is Touko, someone who has rejected the love of everyone who confesses but knowing that Yuu has never felt "love" she falls in love immediately and unlike Yuu she is clinging to what she wants intensely, which is a lame goal.
Although it can be slow what the play conveys is genius, with unusually realistic characters interacting splendidly, with subtleties like when her father accidentally slips in a homophobic remark and it has a direct repercussion on Yuu it's subtle but noticeable. Also how it depicts homosexual relationships is very good, without fetishizing its characters at all, but as I said this is not the main theme.
Continuing now with spoilers you have to notice the Title a little bit which translates as "become you" while in English "Bloom into you" which means practically the same thing and the 3 most important characters do it in their way
Touko: Well it's kind of obvious the fact that Touko is obsessed with her sister, but thanks to Yuu she realizes that even that "perfect" side and that weak side are equally real, since they are her achievements, not her sister's and not Yuu's either, they are her own.
all the things imitating her sister are hers and no one else's, this little by little is "Blossoming" to the Touko she wants to be, she wants to be together with Yuu.
Yuu: With Yuu we are shown at first an "empty" character so to speak, someone who lacks interests beyond the trivial, who has never felt love and that bothers her somehow. When she meets Touko little by little her idea of love is distorted, changing her "logical" attitude to a more selfish one with what she wants, to finally realize that her love with Touko was slow but sincere, blossoming.
Sayaka: Sayaka rejected her homosexuality until she realized that she loved Touko, cowardly ran away from her feelings, and preferred everything as it was. When Yuu appeared, she dared to confess and Touko took it as genuine, true. He even blossomed into a friendly relationship with her.
In the end in the course of the story each of the protagonists are blossoming, an intensely exquisite work. With phenomenal character development and a very beautiful message that became my favorite anime. I still remember in my mind the scene where they are doing the play and it fabulously captures what Yuu wants for Touko, the positive selfishness so to speak. Or the first kiss so shocking as I wasn't expecting it but in the end it's beautiful in its own way. Or the declaration of Yuu's feelings in the blocks when he finally understood everything or at least from his perspective. Unforgettable moments leaves me with an exquisite taste in my mouth. Also at the time I read/watched it I managed to empathize with many characters something that doesn't usually happen to me, with Maki, with Yuu and even Touko.
If there is something I have to say that I don't like is its unrealistic atmosphere, even though the characters feel very human, the fact that most of them are lesbians and no heterosexual love is developed is not very convincing. Even though it is a yuri, I don't find it horrifying but maybe I would have liked a little more realism in that part.