"Sweet Blue Flowers," also known as "Aoi Hana," is a yuri anime series adapted from the manga by Takako Shimura. The story centers on the rekindling of a childhood friendship and the exploration of romantic feelings between two girls, Fumi Manjōme and Akira Okudaira. Fumi, a reserved and introspective girl, transfers to Fujigaya Girls' Academy after her family moves back to Kamakura. There, she reunites with Akira, her childhood friend, who attends the neighboring Matsuoka Girls' High School. Their bond deepens as they navigate the complexities of adolescence, relationships, and self-discovery.

Fumi's life becomes intertwined with the lives of other students, including Yasuko Sugimoto, a charismatic upperclassman at Fujigaya who captivates Fumi with her confidence and charm. Fumi develops romantic feelings for Yasuko, but her emotions are complicated by Yasuko's existing relationship with a male university student. Meanwhile, Akira supports Fumi through her emotional struggles while grappling with her own feelings and uncertainties about their evolving relationship. The narrative also explores the dynamics of other characters, such as Kyoko Ikumi, a classmate of Akira's who harbors unrequited feelings for her, and Kō Sawanoi, a friend of Fumi's who provides a contrasting perspective on love and relationships.

The series delves into themes of identity, love, and the challenges of growing up, portraying the characters' experiences with sensitivity and realism. Fumi's journey of self-acceptance and her exploration of her sexuality are central to the story, as she learns to navigate her feelings for Yasuko and her deepening connection with Akira. The anime captures the quiet, introspective moments of its characters, emphasizing their emotional growth and the subtle nuances of their relationships. Through its grounded storytelling and well-developed characters, "Sweet Blue Flowers" offers a poignant and authentic portrayal of young love and friendship.