Mirror Area
The Mirror Area, internally referred to as "Twoside", is an optional area in Black Space. It is always the fifteenth area Omori will visit.
Overview
This small, looping room is filled with mirrors and strange, red faces. A hellish, disorientating droning noise plays in the background. Interacting with one of the mirrors will cause Omori to smash it; doing so will cause the room to grow darker, as well as making his reflection in the remaining mirrors increasingly bloody. A variant of Hellmari that strongly resembles a broken mannequin will spawn after every mirror is broken. Getting close to her will make her shriek, and interacting with her will make her teleport away.
The key is out in the open and can be collected anytime.
Like in the other rooms, collecting the key will spawn Red Hands that will teleport you back to the Black Space hub.