The 100 Girlfriends Who Really, Really, Really, Really, Really Love You S2 Ep 1 - F2F Body Swaps

Season 2 Episode 1 Her Name
Kusuri makes a potion that causes the first six girlfriends to switch bodies. They find that kissing Rentarō drives their souls out of their new bodies. One by one, they all kiss him, allowing them to switch back to their own bodies.