Sorata Muon is a seemingly ordinary, even a tad boring art college student and a part-time high school teacher.

"Mei Momozono" action figure

But what you see is definitely NOT what you get because, in reality, he's a notorious cat burglar dubbed the "Mouse." With three beautiful accomplices Mei, Hazuki, and Yayoi, he always gets what he wants... From the most coveted international treasure, to an ancient relic inside a museum (with the museum still "attached" to it as a bonus). He even steals a huge highrise building! He has a mortal enemy in the form of a secret society secretly known(?) as the 4S, and its top agent simply known as the One.