The item screen will show up right at the beginning of the mission, and once you exit, you have exactly 3 game minutes (going through doors stops the count) to get from the ground floor of where you are, back to the bottom of the tower where the locked door was.
The way back is there, but there's one slight hitch. The only door out is locked, and a Shadow is your foe. Defeat it ASAP, unlocking the door in the process, and work your way back towards it.
Go through the Bedroom as fast as you can (simply press right and keep it there), jump down the big hole, and check on the door, use the Melanchony Soul, and there ends the second shortest mission in this game.
IF you fail to make it in time, there is a RETRY MISSION.
RETRY MISSION OBJECTIVE: Recharge the [Melanchony Soul], challange again
Remember the short corridor to the right of the Lion Statue? Head back there, check on the statue at the end of the corridor to recharge the Melanchony Soul. After which you'll be able to restart the mission from square one, fighting another Shadow in the Fountain Garden.
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