People will never forget the day when an unknown black matter suddenly appeared in the sky, followed without warning by a general mutation, and zombies instantly filled every corner of the world! Katyusha is a mysterious schoolgirl who fights against zombies with her huge sword. She has a very brave and persistent character, but deep down she lacks a man who would support her fight... She is a member of Alpha 19, which rescues survivors and turns them into soldiers. Her parents eaten by zombies