The most beautiful girl in school, Himuro Mai, appears before Yuu. After learning that she's actually the light novel author, Enryuu Homura, she announces her desire to study Towano Chikai's talent and begins forcing her way into his private life.
In that case, this beautiful young 
girl must be your little sister, yes?
Dann muss dieses hübsche Mädel
deine kleine Schwester sein, korrekt?
En ese caso,
¿esa chica linda es tu hermanita?
Entonces, ¿esta chica tan mona
es tu hermanita?
J’imagine que cette beauté
est votre petite sœur…
Allora questa bellissima ragazza
dev'essere sua sorella minore?
Nesse caso, essa linda
garota é sua irmã mais nova?
Значит, эта прелестная
девочка — ваша младшая сестра?