Muon Sorata is an ordinary college student, however, there is a big secret under him. He is actually a mysterious thief named "MOUSE". He is elegant, wealthy, powerful and influential. After all, he steals everything he sets his mind to. He has three beautiful subordinates (slave girls). Momozona Mei, a computer science and physics expert; Kuribayashi Yaoi, an expert in chemistry; and Kakio Hazuki, an agile fighter, good at combat and sports. And there is nothing that cannot be stolen by "MOUSE".