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...
Were you asking me what 
makes my little sister so cute?
Hast du gefragt, was die Niedlichkeit
meiner kleinen Schwester ausmacht?
¿Me preguntabas por qué
mi hermanita es tan linda?
¿Me preguntabas por qué
mi hermanita es tan mona?
Donc,
Allora... mi stavi chiedendo cos'è che
rende così carina mia sorella, vero?
Era sobre por que minha
irmã é tão fofa, né?
Итак... Вы вроде спрашивали, 
в чём прелесть моей сестры?