"Shin Ace o Nerae!" is a sequel to the original "Aim for the Ace!" series, continuing the story of Hiromi Oka, a young tennis player striving to overcome personal and professional challenges. The narrative picks up with Hiromi now a senior at Nishi High School, where she has become a key member of the tennis team. Despite her growth, she continues to face intense pressure and self-doubt, particularly as she competes against formidable opponents and navigates the expectations placed upon her by her coach, Jin Munakata, and her peers.

The series delves into Hiromi's struggles to balance her passion for tennis with the emotional and physical toll it takes on her. Her rivalry with Reika Ryuzaki, a talented and confident player, remains a central focus, driving much of the tension and drama. Reika's presence pushes Hiromi to confront her insecurities and refine her skills, highlighting the competitive nature of the sport. Alongside these challenges, Hiromi must also manage her relationships with teammates and friends, including Kyoko Otowa, whose unwavering support provides a counterbalance to the pressures she faces.

As the story progresses, Hiromi's journey is marked by significant matches and personal growth. The series emphasizes the mental and emotional aspects of competitive sports, portraying the sacrifices and determination required to excel. Hiromi's evolution as a player and individual is depicted through her interactions with Munakata, whose tough-love coaching style continues to shape her approach to tennis. The narrative also explores themes of perseverance, teamwork, and self-discovery, as Hiromi learns to trust her abilities and embrace her role as a leader on the team.

"Shin Ace o Nerae!" maintains a focus on the intricacies of tennis, with detailed depictions of matches and training sessions that highlight the technical and strategic elements of the sport. The series builds on the foundation of its predecessor, offering a deeper exploration of its characters and their motivations. Through its portrayal of Hiromi's journey, the series captures the highs and lows of competitive athletics, presenting a compelling and realistic depiction of the challenges faced by young athletes striving for excellence.