Tensei Danzou Oujo wa Kekkon Aite wo Sagasanai

"Until we graduate, become mine. Or even If I do this——" Princess Alicia hates the idea of a political marriage, so her mother offers her an alternative crossdress and enter the boys-only magic academy, and choose one of the suitors to be her fiancé! Though it sounds impossible, Alicia fell in love with Lucius, an incredibly handsome gentleman who isn’t even a potential suitor. Yet somehow, Lucius knew right away that Alicia was a girl, and stole a kiss! Alicia reincarnated into another world based on her beloved BL short novel, and her path to romance begins…! After much anticipation, everyone’s favorite romance fantasy has become a manga!

(Source: Endless Journey)