Dedicated and meticulous student Eiichirou Maruo, concerned about his health, decides to incorporate exercise into his routine. Intrigued by a flyer, he joins the Southern Tennis Club at the start of his freshman year. There, during a trial session, he encounters Natsu Takasaki, a fellow first-year with dreams of tennis stardom driven by her passion for the game. In contrast, Eiichirou's academic pursuits stem from obligation rather than enjoyment. Yet, his regimented life takes a turn when his exposure to tennis sparks a newfound fascination. 'Baby Steps' follows Eiichirou's journey as he harnesses his diligent, perfectionist nature to craft a unique playing style. With each practice, his skills evolve, propelling him towards a goal of matching the prowess of top tennis players.