Sono Omoi wa, ne

Shiori, a high school girl, wakes up one morning to find that she has grown bird-like wings on her back. It is said that this is a rare occurrence during puberty known as “ancestral devolution." What are the wings good for, when they can't even fly? How will Shiori deal with this? (Source: Aokishi, translated) *Note: Originally published in Aokishi 4.*