Yamada-kun and the Seven Witches

Yamada-kun and the Seven Witches (2015) is a animation, comedy, mystery with 1 season, rated 8.2/10.

One day, high-school boy Yamada bumps into the beautiful girl Shiraishi on the stairs (literally), and their lips touch as they fall. When they regain their wits, they realize that they have swapped bodies. As time progresses, the two realize that this is not the only mysterious happening in the school.