The Whole of Humanity Has Gone Yuri Except for Me — Hiroki Haruse

Marika Uruuno is just a normal girl in a normal world. She'll fall in love normally, get married normally, and have a normal family- or that was the plan anyway. But when she suddenly wakes up in a version of reality filled only with women, she finds herself questioning what exactly “normal” means and why it's so important to her. And as Mariko discovers something even more precious, she's faced with a choice-will she find a way back to her previous life…or will she stay in this strange new world?