In the Omori game you can obtain a number of keys. These keyboard keys are labeled with a capital letter. The letter keys start with A all the way to Z. You can find the X key here.
Omori Location Key Y
You can find the Omori Y Key in the Snowglobe area.
Only Omori can collect the Y Key. In case Kel, Hero or Aubrey are leading the party the Y letter key will be semi-transparent. A semi-transparent key can not be collected.
Looking for Key Z. Find the Omori Key Z.
You can find all Omori key locations here.