I started on DQ9. I wonder, does this feel like a protagonist character to you? I'm always fishing around in chests for stuff to wear. Tag mode is so much fun, I can't help myself.
So, I'm gonna go with this being a user-created protagonist from DQ9 and tag it so.
Things I learned from extensive web searching when my dictionaries failed me: タンス does mean treasure chest in this context. すれ違い通信, or "communication in passing," is Japanese for Tag Mode in DQ9.