Nakazawa Katsutoshi is the coach of the Seiseki High School soccer team in the anime Days: Tōin Gakuen-sen. He previously played for the same school during his own youth. As a coach, he possesses a keen ability to identify and nurture individual players' potential, particularly with key figures like Hisahito Mizuki, Tsukushi Tsukamoto, and Jin Kazama. He is not afraid to make unpopular strategic decisions, such as keeping a talented player like Mizuki on the bench when he believes it benefits the team. Nakazawa has a calm and observant demeanor, often evaluating situations before acting. He is a divorced man, which hints at a personal history that may have shaped his pragmatic and sometimes stern approach. The players secretly refer to him by the nickname "hige," due to his noticeable chin beard. His role in the story is primarily a supportive one, guiding and challenging the team from the sidelines during their high-stakes matches against formidable opponents like Tōin Academy. His relationship with his players is built on a foundation of tough discipline and genuine concern for their growth, pushing them to surpass their limits. Over the course of the narrative, Nakazawa's trust in the team's development becomes increasingly evident, and his strategic insight proves crucial in the team's progress. His notable abilities include tactical planning, player development, and the resolve to make difficult choices for the long-term success of the team.