Atsuko was a Japanese girl from Nagasaki, who lived in the city's countryside. While she was in the woods, she met two American soldiers who just escaped from a prison camp. The two saw her and started arguing on whether they had to kill her or not: Lt. Ethan Warren insisted on disposing of her, but Logan convinced him to spare her, menacing his partner to kill him if he shot her. The two departed, and Logan stayed with the girl.

Atsuko and Logan passed some time together, and fell in love. They started a life together, but soon after Warren came back to seek revenge on his fellow soldier. After shooting Logan, Warren assaulted Atsuka and tried to rape her, but the girl defended herself with her father's sword. In rage, Warren used his bayonet to stab and kill Atsuka.