Etrian Odyssey Untold: The Millennium Girl/Gladsheim AREA I

After you arrive the soldier will give you 3 Medica and a Nectar. You can speak to the soldier again to rest. Begin exploring the area. At D2 is a locked door and a small crevice opposite of it. Go through the crevice and touch the switch inside. This will unlock the door. Another animated cutscene will play where a girl comes out of a capsule. Three others join you as a monster attacks.

Boss: Errant Camel
The Errant Camel is weak to elemental attacks.