In A.D. 1997, after failing to conquer Earth, Compiler and Assembler from Another World settle in the home of Nati and Toshi Igarashi, whom they select as their partners. As they begin their literally otherworldly communal life, various Sudaran assassins arrive from Another World one after another to attack Compiler and Assembler, until, in due time, all of these events fade into old memories... Yes, in 2000, the final year of the century, Assembler has started leading a quite different life—a life as a "human being"...