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The Classroom 3-A Key (3のAの鍵 San no A no Kagi ) is an item found in Corpse Party.
Yui Shishido finds the key sitting on the group in the west staircase. She uses the key to unlock the door to classroom 3-A.
- This is one of the only two items that can be collected by Yui in Corpse Party, The other one being Power Stone.