Not in the sense of transness. A character dresses as a boy when she goes on adventures, to disguise herself from her parents. The protagonist refers to her as a boy when they first meet her. She is depicted as not caring how people perceive her. It is a "Mulan" type scenario. However, multiple characters do refer to her with feminine terms when she is disguised as a boy, which might be upsetting from a transmasc perspective. The character is also referred to as "Girboy" when in disguise after she reveals herself to the protagonist, which is a little questionable. The character however doesn't seem to mind any of this, and is comfortable with the fluidity of her gender. Her gender is not the focus of her story, as her character arc is more about her relationship with her parents.