Hajimete no Gal centers on Junichi Hashiba, a high school boy whose life is shaken when his perverse friends set up a prank that pushes him to ask out Yukana Yame, a stylish gal, in a desperate bid to stop being a hopeless virgin. Yukana is disgusted by Junichi's groveling at first, but his clumsy honesty and her teasing remarks slowly create an unlikely bond between them, and she eventually accepts his confession, leaving him stunned.
What begins as an embarrassing joke soon turns into a messy romantic comedy about insecurity, attraction, and the chaos that follows one impulsive confession. Junichi is suddenly dragged into a new school life filled with lively girls, awkward encounters, and constant humiliation as he tries to build confidence and keep his thoughts in check. Around Yukana and the people who keep getting pulled into his daily life, every interaction becomes a test of his nerves, and every mistake only makes the situation more chaotic. Hajimete no Gal leans into that discomfort to turn a single prank into an unpredictable relationship and a string of awkward, high-energy school days.