Sayonara watashi (2014)

Tomomi and Kaoru were best friends in high school, but the differences in their lifestyles have created a distance between them. Tomomi has built a happy family that everyone envies while Kaoru lives for her career as a movie producer. The two friends meet again at the present age of 41 at a class reunion and return to their former closeness. However, things get complicated when Tomomi finds out that her husband and Kaoru are having an affair. Then the two women awake to find their bodies swapped.