I recently came across a manga that involves magical items so I thought of this thread right away. This time, this story is about a lot of magical antiques being either used properly or misused.
In terms of "organizations", I have only read the first chapter so I'm not exactly sure on whether they fully exist. However, there are bad people using these magical items the wrong way and the main character is now stuck with helping this girl run her "business". One of antiques involve reversing time.