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 N key here.
Omori Location Key O
You can find the Omori O Key near the entrance of Last Resort close to the pool. The O letter key is clear visible.
Only Omori can collect the O Key. In case Kel, Hero or Aubrey are leading the party the O letter key will be semi-transparent. A semi-transparent key can not be collected.
Looking for Key P. Find the Omori Key P.
You can find all Omori key locations here.