Futaro is hospitalized for a while after falling sick at camp school. He returns to work tutoring the quintuplets, only to realize someone has fallen way behind.
Futaro-kun, it could be that 
the culprit isn't among us.
Futaro, es könnte doch sein,
dass die Täterin gar nicht unter uns ist?
Futaro, es posible que la culpable
no esté entre nosotros.
Futaro, es posible que la culpable
no esté entre nosotras.
Fûtarô,
Futaro-kun, può darsi che
la colpevole non sia una di noi.
Fuutarou-kun. Talvez a culpada
não esteja entre nós.
Футаро... А вдруг виновница
всё же не одна из нас?