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...
You don't understand little sister moe.
Du versteht das Moe
von kleinen Schwestern nicht.
Pensé que entenderías
el moe de hermanitas.
Pensé que entenderías
el moe de hermanitas.
Vous ne comprenez rien
à cette fascination.
Lei non capisce affatto
il moe che caratterizza una sorellina.
Você não entende o que
é moe de irmãzinhas.
Вы не понимаете 
прелести младших сестёр.