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...
I'm your "deredere" little sister,
Ich bin deine „Deredere“-Schwester,
Soy tu hermanita deredere,
Soy tu hermanita deredere.
Je suis une sœur affectueuse,
Io sono la tua sorellina "deredere",
Sou sua irmã deredere,
Я теперь «дере-дере»