On the planet M-79 at the edge of the galaxy, genetic mutations occur in some species due to terrible climate and environment. Mantises have evolved to walk upright like humans and become highly aggressive; They attacked humans who had been sent to the planet; A star war is inevitable; The protagonist receives an order to back up humans by collecting various weapons to fight against the hordes of mantises. A secret which will shock the whole universe on M-79 is then discovered...