Futaro quits tutoring, but the quintuplets convince him to continue. The sisters seem suspiciously eager to please him, and he can’t quite figure out why.
That's so childish!
Das ist kein bisschen erwachsen!
¡Qué infantil!
¡Qué infantil!
Quel comportement puéril !
Che comportamento infantile!
Que infantil!
Детский сад!