The brothers Hiroshi and Hirata Nakamura, the duo known in Japan as “The Punishers” who eliminate criminals of society, died after an explosion aboard a plane. In the Cosmic hyperspace where their souls were kept, a voice contacted them and offered them with a chance for reincarnation by giving them highly strong bodies to live endless lives (unless killed) in another world. Since the new fantasy world where they were to be sent into only accepts 1 soul every 400 years, one of them would have to wait for such years.