20.

Jade watched as Kyo knocked the door down, turning when she saw someone else join them. "Mei?" She turned around and began walking in with the others, thanking Kyo quietly before walking off on her own. 
Once the lights came on, she relaxed a bit as she looked through cabinets and folders. "Wait how do you know this?" Her voice suddenly breaking the momentary silence. She began making her way down a hall, a small wall like barrier of dark magic forming at every door entrance before she walked in, just in case.