A Parallel World With A 1:39 Male To Female Ratio Is Unexpectedly NormalA Parallel World With a 1:39 Male to Female Ratio Is Unexpectedly Normal; 男女比1:39の平行世界は思いのほか普通; Danjohi 1:39 no Heikou Sekai wa Omoi no Hoka Futsuu

Satou Sou is accidentally swapped with himself in a parallel world with a male/female ratio of 1:39. He finds a kind family and lovely women at the place where he was switched. Seeing the outside of these women, he's relieved to see that the number of men and women has changed, but not much else. However, their inner lives are filled with conflicts and troubles.