Masaru Hongo is the goalkeeper and captain of the Kitahara Elementary School soccer team, known as the Kickers. He is a central figure in the team, providing strong leadership and a steady presence on the field. Hongo founded the team together with his friends and serves as its anchor, organizing the defense and motivating his teammates through difficult matches. His primary rival is Hikaru Uesugi, the formidable goalkeeper of the opposing team the Red Devils, and their confrontations are a recurring focus of the story.

Hongo is characterized by a serious and responsible demeanor, often acting as the emotional backbone of the Kickers. He is deeply committed to the team's success and works hard to maintain unity, especially when internal conflicts arise. Off the field, he develops romantic feelings for Ayumi Daichi, the sporty sister of the team’s new striker, Kakeru Daichi. This affection leads to both comedic and awkward situations, especially with the team’s cheerleaders, and adds a personal layer to his role.

His motivation is rooted in a desire to see the Kickers grow stronger and win their matches, and he takes pride in his position as captain. Hongo’s notable ability is his skill as a goalkeeper, where he displays quick reflexes and a strong presence in the penalty area. He is also a capable strategist, often directing the team's formation and encouraging collective effort over individual glory.

Throughout the story, Hongo develops alongside his teammates, particularly Kakeru Daichi, whose arrival revitalizes the team. He learns to balance his leadership with trust in others, and his relationships deepen as the team faces challenges like the arrival of the disruptive talent Harry. Hongo remains a steadying influence, helping the Kickers overcome both external opponents and internal discord.