Existence Change App ~I Was Changed into My Sister~

In the middle of living a steady life, I was deprived of my position as a guy and was cuckolded of my girlfriend and myself... Hiroshi, a college student, was having a nice and fulfilling life with his younger girlfriend, Emi. One day when he took her home, a man looking exactly like him appeared. He used a mysterious app to turn Hiroshi into a girl and started toying around with his appearances and personality... Official English Version for sale: PIXIV FANBOX