Natsume overhears whispers that a powerful youkai is reviving, later that evening he is trapped in a bottle as an offering.  Humans can’t see or hear him, so Nyanko-sensei decides to help the “best” way he can…
Sensei, politely!
Sensei, sea cortés. 
¡Trátelo con cortesía!
Maestro, con educación, ¡con educación!
Mestre, mais educação!