I love these two their so adorably badass, thank you for translating the newest chapter I've been looking forward to this one since Record of Ragnarok seems to be delayed. Well it looks like our girl has regained her fighting spirit and that was quite the killing intent she was emitting in her room and in the hallway. Yujiro Hanma would be proud.
My theory is Shirayuri either doesn't have a room mate, since if she did she would likely indoctrinate her roomie into being her vidya sparring partner, or if she does have one she's either used her status, oujo aura, or bribes to gain/buy/force her silence. Or Shirayuri could just be somewhat good at hiding her stuff. Her gear while impressive is a rather small amount so as long as she isn't careless with it she should be able move it around and keep in it her room as long as its kept in the case she's been shown to have.
I love that though they literally action movie style jumped and broke through a closed window and kept running that's both so cool and kawaii it's somehow ascended into the wholesome domain.