This is a good manga, but also abstract. Three teenagers trying to deal with death, loneliness and the reality of life. The protagonist lost his best friend due to an accident, which made him lose all motivation. One cold winter day he meets a strange girl sitting in the cold and waiting for someone. This person turns out to be a masked man wielding a chainsaw, who attacks her right away. Instead of running away, the boy sees his chance to get away from his boring life - and reality - and tries to help her. From that day on he tags along and stands by every day watching them fight. But who is this mysterious man who can't die and why does he attack the girl?