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...
As your little sister, it's my duty 
to oversee all of your training.
Als kleine Schwester ist es meine Pflicht,
dein Training zu überwachen.
Como tu hermanita, mi deber
es supervisar tu entrenamiento.
Como tu hermanita, mi deber
es supervisar tu entrenamiento.
En tant que sœur,
Perché, in quanto tua sorellina, ho il dovere
di supervisionare il tuo allenamento.
Como sua irmã, tenho a obrigação
de acompanhar seu treino.
Мой долг, как младшей сестры, 
следить за твоей тренировкой.