Solitary ~Flatting wings~

Tsubasa is an innocent girl who has lost her parents in a traffic accident, but has a older brother who is older than her, has a heartbreaking tragedy, has few friends, and is irresistible to love her older brother. Because she is pure heart, she was a girl who treated every odd person in a friendly way. One day, an old man who is bird watching in the park approaches him and follows him home... As I was looking at Kotori's encyclopedia, I saw what the man was like... A shaved girl who loves Kotori and her big brother.