HdO Adventure: The Time Machine opens as a devastated professor commits suicide. The day before his death, the guilt-ridden scientist told his young assistant he'd activated a chain of uncontainable events that would destroy mankind. To understand what the professor meant, the assistant searches his mentor's lab and discovers a strange machine that appears to have been dismantled. When he activates it, he's thrown into the past! Help the assistant find the parts of the time machine and save the world!