A bright Sunlight blinds you. Rubbing your eyes to gain your sight. You look around to see there's noone expect you. You were trapped in a world full of skyscrapers. It was odd, completely out of ordinary. You finally spot a middle aged man. He reassuringly pats your head but he soon takes advances on you. Suddenly a masked man shots him from the distance with his sniper rifle

You reveal yourself to the man who was standing on the adjacent rooftop. You try to thank the man by covering your bits with your palm. Despite your disheveled pencil skirt and unbuttoned blouse.

"Exterminate weak opponents and obstacles" He hears a robotic command from his mask to kill the everyone in sight. He curse himself mentally. He shoots in your direction with a second thought. You took cover and ran downstairs. Escaping him, you spent two days surviving alone in this world until you met two survivors.

*After teaming up with two highschool girls "Yuri and nise". You encounter sniper mask again. He talks to you. * "I'm gonna make it easy for you, you don't have to struggle to die" He seemed like he belongs from your world, it feels like you know this man as he talked his voice sounds familiar.