From Spoils:

Kuresaki Karen is attending Akemi Academy for one reason and one reason only: “to find the man with a scar on his chest.” Karen herself is harboring a secret she can’t let anyone find out about...a magical one.

One day, during her investigation, she overhears a rumor concerning the school doctor Amemiya: apparently he has a scar on his chest…

Could he be the one she's looking for!?