Natsume gets a call from a relative: his parents home is being sold.  He tells himself that it doesn't matter, and that he's forgotten his past.  But he's not nearly as over it as he thinks...
So it's easier to just 
forget about them, Sensei.
Cosas así es mejor olvidarlas, sensei.
Y cosas así es mejor olvidarlas, maestro.
Então é mais fácil esquecer delas, Mestre.