"Anyone You Can Do... I Can Do Better!" centers on the competitive dynamic between two high school students, Haruto and Aoi, who are constantly vying to outdo each other in academics, sports, and extracurricular activities. Haruto, a naturally gifted but laid-back individual, often relies on his innate talent to excel, while Aoi, a hardworking and disciplined overachiever, dedicates herself to meticulous preparation and effort. Their rivalry begins in their first year of high school when Haruto casually outperforms Aoi in a class ranking, sparking her determination to surpass him at all costs.

The narrative unfolds through a series of escalating challenges, ranging from school-wide competitions to personal bets, as Haruto and Aoi push each other to their limits. Their rivalry is fueled by mutual respect, though neither is willing to admit it openly. Supporting characters, such as their classmates and teachers, often find themselves drawn into the duo's antics, either as mediators or unwitting participants in their contests. Over time, the story explores themes of ambition, self-improvement, and the balance between natural talent and hard work.

As the series progresses, the rivalry takes on a more collaborative tone, with Haruto and Aoi occasionally teaming up to tackle larger challenges, such as school festivals or inter-school competitions. These moments highlight their growing understanding of each other's strengths and weaknesses, subtly shifting their relationship from pure competition to a more nuanced partnership. The series concludes with both characters reflecting on their journey, recognizing how their rivalry has shaped their growth and prepared them for future endeavors.