Aki Sora: Yume no Naka - S01

Siblings Aki and Sora Aoi have been in a secret relationship since confessing their feelings to each other on a rainy day. Sora's twin sister, Nami, unaware that his heart belongs to someone else, convinces him to join the Fashion Research Club at school, hoping to set him up with their classmate, Kana Sumiya. But Nami's actions hide a deeper pain. Though she seems like a caring sister trying to help her brother find love, she secretly struggles with her own forbidden feelings for him.