Where is the house key in the Onyx Ward?

[Mistyride]

as in, the girl who says she's locked out.

[Fumble]

Underground Railnet, available only after you beat Aya. There are Rock Smashable walls, and one of them will have a small room with the Key, I believe.

[Despair Syndrome]

It's in the second part of the Underground Railnet.

You need Strength to get there.

If you're already there, it should be inside a rock smashable wall.

EDIT: Ninja'd~ Wp, Chubb, you win this round.

Edited February 7, 2016 by Despair Syndrome