Baby Steps tells the story of Eiichirou Maruo, a studious high schooler who takes up tennis to stay fit. Initially a beginner, his analytical mind helps him quickly improve as he meticulously studies the sport, turning weaknesses into strengths. Through local tournaments and training at his school’s tennis club, he forms bonds with players like Natsu Takasaki, who inspires him to aim higher. Eiichirou’s journey begins with small victories, showcasing his growth from a novice to a promising competitor.

As Eiichirou’s skills advance, he sets his sights on national and international stages, competing in prestigious tournaments like the All-Japan Junior Championship. His strategic play and relentless determination earn him recognition, even as he faces formidable opponents. Alongside his athletic rise, his bond with Natsu deepens, adding emotional depth to his pursuit of becoming a professional tennis player. The story highlights Eiichirou’s steady progress, proving that hard work and intellect can turn even the smallest steps into giant leaps.