"Brother... Do Feiku have to go?"
She was thrown into the world ten years ago.
"Sawada... Does Hiku have to do it?"
She was thrown back into the family with her brother.
"Feiku is on my brother's side, right?"
"Feiku is on Vongola's side, right?"
Feiku doesn't know...
Feiku really doesn't know anything.
This is a story about a natural girl who is haunted by the fight between her brother and Vongola.