This is the MSX2 software "T.D.F: Kaijuu Daisensou - Kesshi no Genshiro Bouei Sakusen" (T.D.F: Monster War - Decisive Reactor Defense Operation) by DATA WEST. It starts up as shown in the photos, but there is no instruction manual. Please excuse any scratches or wear on the package. I have stored this in a dark place, and I am a non-smoker with no pets. Thank you very much.