Junichi Hashiba invites a girl out after a prank perpetrated by his twisted pals in an attempt to change the fact that he's a hopeless virgin. Junichi's groveling disgusts Yukana Yame, the girl in question. However, after a series of taunting remarks, she gradually finds herself bonding with him and, to to his surprise, accepting Junichi's confession. Hajimete no Gal follows Junichi as he overcomes his lack of self-confidence and controls his sexual desires while being pushed into a new school life full of vivacious females and unpredictable mayhem.