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.