You are asked the question and you say nothing, because every answer you have costs somebody in that room their life.
The court decides without you. She is convicted on the seventh day and taken away and does not ask you why.
Mione is gone by October. The Ministry takes the cottage back and the trunk goes to an evidence store.
You walk out of the last door in the house and there is nothing in it, not even the version of you that could have answered.
It is the only ending where nobody is punished for a choice you made.