Wakabayashi's younger brother encounters Hige and Mioko out together, and teaches Mioko something that should help her get between his sister and Hige...
That's normally not necessary.
.هذا ليس ضروريًا طبيعيًا
Normalerweise brauchen wir das nicht.
"Normalmente" eso no se necesita.
Ce n’est pas nécessaire, normalement.
Non  è normalmente necessario.
Não é normal fazer isso!