Sora no Mannaka

Amasawa Miyako is the middle of five siblings and the only one considered ordinary, while the rest are both attractive and skilled in various areas. She manages household duties like cooking and cleaning since their parents are often occupied with work. Miyako struggles with her self-esteem and the perception that she doesn't measure up to her siblings. Matters are complicated further by her feelings for her best friend, who is romantically interested in her older sister.