one day my partner was possessed by the duke

So-a knows that having a crush on a childhood friend can be complicated, but it’s even harder when he gets possessed by… the duke?! When So-a’s friend Yuseong is suddenly possessed by Duke Hereis De Licariel, they must figure out a way to get Hereis back home -- which is easier said than done when Hereis sounds like he came straight out of a fantasy novel! Can So-a get her childhood friend back while having to juggle academics, sports, and a duke who also happens to be a swordmaster?