"Akiba-chan" centers on the life of Akiba, a young girl who unexpectedly becomes the mascot for Akihabara, Tokyo's iconic electronics and otaku culture district. The narrative explores her journey as she navigates her new role, balancing her personal life with the responsibilities of representing a bustling hub of technology and subculture. Akiba is portrayed as an ordinary girl thrust into an extraordinary situation, tasked with promoting Akihabara while dealing with the quirks and challenges of its vibrant community.

The plot unfolds as Akiba interacts with various characters who embody the diverse facets of Akihabara, from tech enthusiasts and anime fans to shopkeepers and tourists. Each episode highlights her efforts to connect with these individuals, often leading to humorous or heartwarming situations. The series delves into the cultural significance of Akihabara, showcasing its evolution from a tech-centric district to a global symbol of otaku culture. Akiba's growth as a character is tied to her deepening understanding of the district's history and its impact on the people who frequent it.

Supporting characters include Akiba's friends and colleagues, who provide comic relief and emotional support as she adjusts to her role. The series also features recurring figures representing different aspects of Akihabara's identity, such as a passionate gamer, a dedicated cosplayer, and a nostalgic shop owner. These interactions emphasize the district's multifaceted nature and its ability to bring people together.

The storyline incorporates themes of identity, community, and cultural preservation, as Akiba learns to embrace her role while staying true to herself. The series balances lighthearted moments with reflective scenes, offering a nuanced portrayal of Akihabara's significance in contemporary Japanese culture. Through Akiba's experiences, the narrative celebrates the district's unique charm and its enduring appeal to both locals and visitors.