Be it about one sided love or trying to fit a role that you feel is expected from you, Kuzu no Honkai and Yagate Kimi ni naru touch very similar themes. It is very hard not to compare the relation Yuu and Touko hold to the one Hanabi and Sanae have. The tone takes a lot of similarity as well in the way both anime are told from the point of view of a female main character who is struggling with understanding love and her own feeling. Their internal monologues are filled with sadness of how lost they are and how different from the rest of the people they feel they are.  read more
Yagate Kimi ni Naru is a great Shoujo Ai and contains all the features of a forbidden lesbian relationship in a very conservative Japanese culture. Unlike the forbidden step-sister love of Citrus, Yagate Kimi ni Naru is confined to a first-year high schooler and her Senpai.
I definitely recommend watching both.
Both shows are about 2 girls in high school who develop love for each other along with drama and romance. The 2 main characters are quite different from each other and have difficulties trying to understand each other and the tension can sometimes go high. I think both shows try to show how difficult it can be for 2 young girls to experience this kind of love and everything that goes around it.
Both are yuri, and have similar settings; I think Aoi Hana is the better of the two, granted, since while it is also slow boil, the heroines have a pre-existing friendship to build on rather than the suddenness Bloom Into You goes for.
Both shows are very similar due to their slow pace, gradual exploration of the motivation and actions of the characters, as well as the rather subtle and attentive development of the romantic line. The main difference, of course, is that Yagate Kimi ni Naru is a melancholic shoujo-ai, and Oregairu, on the contrary, is a sarcastic school comedy with a male lead.
Moreover, I do not know whether it is intentional or not, but Touko and Yuu are so similar to Yukinon and Yui that sometimes it may seem like a yuri fanfic on Oregairu, especially considering the popularity of Yukinon/Yui pairing. In any case, if you liked Oregairu and you are not against the lesbian theme, then you will definitely enjoy this show. read more
Both anime tell us the story about two high school girls, who's fall in love with each other; Both are focusing on realistic relationship; Both main heroine are shy before they meet their love, which is strong and confident.
While Hibike! Euphonium isn't centered around romance, I think both have some similar themes such as hiding one's feelings and dealing with the struggles of growing up. Also, the main characters' personalities and interactions remind me of each other (Oumae being similar to Koito and Asuka being similar to Touko). Both shows reveal multiple facets of the main characters' personalities and touch on believable doubts, thoughts, and dreams that people might have in high school.
A twin tailed freshwoman girl gets entangled into the student council due to the insistence of a hot long black haired second year girl, Yumi and Sachiko's school is a Catholic girls only, while Yuu's and Touko's is secular and mixed genre.
Both are also romantic shoujo ai, Yumi and Sachiko are very close to each other, due to the more solemn ambiance of Maria-sama, but never crosses the line to overt lesbian love; Touko's love is more unidirectional in the first part of Bloom into You, and Yuu is mostly indifferent at the start of the anime.
Maria-sama ga Miteru has a expansive cast and gives more time to the relationships and problems of the other girls, but Yagate Kimi ni Naru is mostly focused in the main pairing of Yuu and Touko.  read more
Shows feature extremely similar topics, and if you like Yagate Kimi ni Naru, you will probably also enjoy its less popular predecessor.
Both shows cover a lot of romance between its two female protagonists but also takes on a lot of darker and deeper themes. Strawberry Panic, much like Yagate Kimi ni Naru, also has one of the characters being the president of the student council. Something that I enjoy about each of these shows is how little annoying drama there is apart from a few understandable characters. Strawberry Panic can be seen as a little outdated, but I recommend giving it a shot. read more