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 V key here.
Omori Location Key W
Humprey vomits Omori Key T and Key W near you. You can find Omori W key near you. You need defeat Humprey first.
Looking for Key X. Find the Omori Key X.
You can find all Omori key locations here.