Kaede Azusagawa is a significant character in the anime series 'Seishun Buta Yarou'. She is the younger sister of the protagonist, Sakuta Azusagawa. Kaede is portrayed as a sweet and caring girl who has suffered from a form of psychological phenomenon known as 'Adolescence Syndrome'. As a result, she developed a different persona and lost her memories of the past. Throughout the series, Kaede struggles with her fear of the outside world and works towards overcoming her syndrome, with the support of her brother. Her character embodies themes of growth, healing, and family bonds.