Hideyoshi loves rice; she can’t get enough of it.  When she hears tale of a ritual that can be performed to guarantee a good harvest of rice, she decides she must do it.  But what happens next takes her farther down the rabbit hole than expected.
It's in exchange for the bountiful harvest.
en intercambio por la buena cosecha.
... a cambio de la buena cosecha.
em troca de uma boa colheita.