Marl

Marl became a novice adventurer not long ago so she was afraid to fight monsters alone but no party was willing to recruit her. After seeing Taishi's performance at the training grounds, she asks him to "go out with her", a misleading suggestion to form a party together to fight monsters. After they go out hunting monsters, Taishi discovers that she's also a complete noob, which is the reason why no party wanted her to join them. She's actually the first princess of the Miscronia Country but was arranged to marry a "scum prince" from a neighboring county so she hightailed out of the castle to become an adventurer instead.