"My First Girlfriend is a Gal" is a romantic comedy anime series centered around Junichi Hashiba, a high school student who decides to break free from his mundane life by confessing his feelings to a popular gal named Yukana Yame. Yukana, known for her outgoing personality and distinctive fashion sense, surprisingly agrees to date Junichi, setting the stage for a series of comedic and awkward situations as the two navigate their new relationship.

Junichi, inexperienced and socially awkward, struggles to understand Yukana's bold and flirtatious demeanor, often misinterpreting her intentions. Yukana, on the other hand, enjoys teasing Junichi but gradually reveals a more genuine and caring side as their relationship progresses. The dynamic between the two is further complicated by their contrasting personalities and the reactions of their peers, who are equally surprised by the unlikely pairing.

Supporting characters include Junichi's childhood friend, Ranko Honjō, who harbors unspoken feelings for him, and his friends Nene Fujinoki and Keigo Ishikawa, who provide additional comedic relief and commentary on the couple's relationship. Ranko's jealousy and attempts to sabotage the relationship add tension, while Nene and Keigo's antics often lead to humorous misunderstandings.

The series explores themes of first love, self-discovery, and the challenges of communication in relationships. Junichi's journey involves learning to overcome his insecurities and understand Yukana's perspective, while Yukana begins to appreciate Junichi's sincerity and kindness. The narrative balances lighthearted humor with moments of genuine emotional growth, as the characters confront their feelings and the complexities of teenage romance.

Episodes often feature exaggerated comedic scenarios, such as Junichi's over-the-top reactions to Yukana's teasing or the group's misadventures during school events. Despite its comedic tone, the series occasionally delves into more serious topics, such as societal expectations and the pressure to conform, particularly through Yukana's experiences as a gal and the judgments she faces.

Overall, "My First Girlfriend is a Gal" presents a straightforward yet entertaining portrayal of high school romance, blending humor, awkwardness, and heartfelt moments as Junichi and Yukana navigate the ups and downs of their relationship.