In order to prevent the novel's heroine from being revised, Yuu must perfect his love of little sister moe. Yuu and Suzuka both attend Sakura's radio program as guests, and Yuu begins flirting with Suzuka while on air as part of his training to become moe for little sisters, but...
It's because she's my little sister.
Das ist, weil sie meine
kleine Schwester ist!
Es porque es mi hermanita.
Es porque es mi hermana.
Parce qu’elle est ma sœur.
È perché è mia sorella!
Isso seria porque é minha irmãzinha.
Всё потому, что она моя сестра.