TV-Series
Description
Eiichiro Maruo is the central character of the story, a high school student whose life is transformed by his discovery of tennis. Initially, Eiichiro is defined by his academic excellence. He is a studious and meticulous honor student who has maintained perfect grades for nine consecutive years, a feat that earned him the nickname Ei-chan, which plays on the Japanese pronunciation of the letter A. His approach to studying is characterized by an almost compulsive need for order and perfection, a trait that manifests in every aspect of his life, from the careful arrangement of his food to the immaculate notebooks he keeps. Despite his academic success, Eiichiro admits to not having a particular passion or reason for studying so hard, doing so more out of duty than genuine interest.

His entry into the world of tennis comes at his mother's suggestion to remedy his lack of physical exercise. What begins as a practical solution quickly evolves into a profound passion. Eiichiro discovers in tennis a challenge that engages his analytical mind and provides him with a goal he can truly call his own. He is a late beginner in a sport where most professionals start training in childhood, but he compensates for his lack of experience with extraordinary diligence. His personality is serious, careful, and tenacious. He is kind and helpful, famously willing to lend his pristine study notes to classmates, though he can come across as shy or awkward, particularly around his love interest, Natsu Takasaki. This shyness is part of his earnest and somewhat naive demeanor, which many of his peers find endearing.

The core of Eiichiro's character and his unique playing style is his ability to apply his academic discipline to tennis. He creates extensive tennis notebooks, often called his Ei-chan notes, in which he records detailed observations about his own play, his opponents' habits, and strategic data. This practice turns him into a quintessential data player, relying on meticulous analysis to formulate his game plan. His natural assets include exceptional dynamic vision, which allows him to follow fast-moving balls with clarity, and a remarkable capacity for analysis. His on-court abilities are characterized by highly precise ball control. He famously visualizes the court as divided into a grid, starting with nine squares and eventually increasing his accuracy to control a division of eighty-one squares or more, placing the ball exactly where he intends. While initially lacking in raw power and possessing a weak serve, his training allows him to develop these areas, adding a fast and unpredictable serve to his arsenal.

Eiichiro's role in the story is that of a determined protagonist on a focused journey from a complete novice to an aspiring professional tennis player. His development is a gradual and realistic process of physical and mental conditioning. He goes through intense training to build a body oriented for tennis, including a pivotal trip to a tennis academy in Florida where he is exposed to international-level competition. A significant part of his growth involves overcoming defeats. After a crucial loss in the All-Japan Junior tournament, he is forced to fulfill a promise to his parents to give up on his professional dream, only to have a new path open through a wildcard entry into the All-Japan Championship, reigniting his ambition.

His key relationships are central to his motivation. His bond with Natsu Takasaki is particularly important; she is a fellow club member with her own professional aspirations. What begins with an awkward first encounter, where she ruins his notebook, deepens as they become training partners and emotional pillars for one another. Their relationship eventually becomes romantic, providing Eiichiro with a source of support and shared purpose. He also shares a significant rivalry with Takuma Egawa, a powerful player at his club whose skill initially intimidates him but also serves as a benchmark for his own improvement. Throughout his journey, Eiichiro transforms from a boy who excelled at studying out of habit into a focused athlete who uses his intellect and unwavering work ethic to chase a professional career, embodying the idea that hard work and a sharp mind can overcome a late start.