Toru Hayashi lives alone with his mother. He is a Young salaryman whose life is a staggering commonplace, his life is always stuck at one place until a pretty young woman moves into the apartment upstairs. Rumi Kato, charming and smart, quickly sympathizes with Tooru. One day, she confesses that she is a professional burglar and asked him to join her. But what Rumi did not know is that besides being a chronic bewildered, Tooru is the most awkward of men ...