Muon Sorata is an ordinary college teacher. However, there is a big secret beneath him. He is actually a mysterious "MOUSE" thief. He is smart, wealthy, powerful and influential. Above all, he steals everything. He has three beautiful female subordinates, but you can refer them as his slaves. Momozona Mei, a computer and physics expert; Kuribayashi Yaoi, a chemistry expert; and Kakio Hazuki, an agile fighter, good at combat and sports. And there is nothing that cannot be stolen by "MOUSE".