Eisaku Ōtomo is a teenage football player from Asakusa who joins the Tokyo Esperion Youth team after passing their rigorous entrance exam. During initial trial matches, he shows visible nervousness but demonstrates strong mental fortitude once games begin, contrasting his anxious pre-match demeanor. Primarily playing as a central or holding midfielder, he focuses on link-up plays and team coordination over individual technical brilliance. While possessing average technical skills in chest control, volleys, shooting, and passing, his standout ability is on-field communication and directing teammates during matches. Physically, Ōtomo is short-statured with fair skin and distinctive dark green hair, shaved on the sides but longer on top. Off the field, he displays a hot-headed and occasionally childish personality, particularly in conflicts with teammate Jun Asari. These clashes often stem from disagreements about new players versus academy graduates, leading to heated arguments during training and matches. Despite this temperament, he values team cohesion and eventually reconciles with Asari. His development at Esperion includes forming close friendships with fellow newcomers Ashito Aoi and Sōichirō Tachibana. He supports Ashito during night training sessions, helps mediate team conflicts, and encourages collective problem-solving among players. Ōtomo's personal motivation stems from a desire to "drastically change his future" through professional football, driving his dedication to training and team contribution. This passion manifests in on-field leadership, such as rallying teammates during difficult matches and maintaining composure under pressure. Beyond football, Ōtomo occasionally leverages his status as a youth player to pursue romantic interests. He resides in the team dormitories alongside Asari, observes senior team practices, and celebrates team achievements with peers. Choosing dormitory life to fully immerse himself in the Esperion program, his background includes being from Asakusa.