Mikakunin de Shinkoukei - Season 1
Kobeni has lived with her Mother and Sister, Benio, for most of her life. When she's 16, Hakuya, a tall, quiet boy, comes to stay with her and it's revealed that they're actually engaged. Kobeni comes to learn about a past injury while fighting her growing feelings for Hakuya and surviving her Sister's sister-complex.
