At that very moment a gunshot was heard. I look over the edge and saw a man on the 5th floor falling down; he got shot in the head.

"Oh my God.." Luna mumbles.

"Just as expected.. there goes the first one." Chisiya says as he watched the scene below us.

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This is a story about Luna, a girl who arrives in borderland. She meets some new people, but also sees a familiar face.
It's time for her first game: Tag. 
Only she has no idea what's in store for her.
Is she going to live? Make friends or enemies? Will she find out what is going on?