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…
Forget that.
Olvídese de eso. Sólo tiene 
que seguirle la conversación.
Olvídate de eso. Tú sígueles la corriente y ya está.
Esquece isso.