Set in Japan 10 years before the start of the main storyline, during the events of the Lost Christmas
incident. The main character, codenamed Scrooge, has been the subject of many experiments over the years along with many others. While on the run he came into contact with Carol, another test subject, and the two escaped together. Soon after they meet a girl called Present, who's fate is somehow intertwined with Scrooge and Carol's.