Saishuu Heiki Kanojo Gaidenshuu - Sekai no Hate ni wa Kimi to Futari de
The story is of a 17 year old Japanese sniper, who hides in the remains of a block of flats and kills enemy soldiers so that he can collect their guns.
(Source: Wikipedia)
Contains the one-shot: Love Story, Killed
A Saishu-Heiki Kanojo side story, Taking place during a modern war, one soldier saves a young girl from being raped by enemy soldiers. Thus begins the short interaction between the two that will lead to tragedy.