Mushoku Tensei: Jobless Reincarnation, Volume 16

For years, Sylphie has lived in disguise as a man, serving as a princess's bodyguard under the alias Fitz. Yet from the moment her childhood friend Rudeus joined her at the University of Magic, she's waited for him to see through that charade, and maybe even fall in love with her. Princess Ariel decides that it's time for extreme measures: If Rudeus is too oblivious to uncover the truth on his own, then she'll engineer a scheme that forces Sylphie and Rudeus into an intensely romantic situation!