Kazuki Sendou begins as a high school student in the original anime and later transitions to college life in follow-up media. A self-taught artist relying on raw talent, he faces rejection from art school, prompting his friend Taishi Kuhonbutsu to steer him toward doujinshi creation. Together, they establish the duo "Brother 2," with Kazuki leading the artwork and Taishi overseeing logistics like printing and event registrations. This partnership forces Kazuki to grapple with crafting original narratives and marketing strategies, pushing his abilities beyond technical prowess into storytelling and audience engagement.

Initially skeptical of otaku culture, Kazuki’s outlook transforms after meeting Yuu Inagawa, an experienced doujinshi creator, at a convention. Yuu mentors him through the subculture’s nuances, coinciding with Kazuki’s struggle to balance creative projects, studies, and personal ties. This tension strains his bond with Mizuki Takase, a childhood friend openly critical of his pursuits. Over time, Mizuki warms to the culture, experimenting with cosplay, though Kazuki remains oblivious to her growing affection.

Financial strain from printing expenses drives Kazuki to part-time work, grounding his ambitions in economic reality. As he navigates these pressures, he cultivates patience and embraces the doujinshi community’s collaborative spirit. Connections with peers—like aiding reserved artist Aya Hasebe in sales and clashing with rival Eimi Ohba—refine his approach to merging creativity with commerce. His arc traces a path from untrained prodigy to a determined artist prioritizing originality and persistence.

Expanded narratives like *Comic Party Revolution* deepen Kazuki’s convention-circuit involvement, testing his ability to sustain creativity amid commercial demands and intricate social dynamics. His journey consistently underscores the clash between artistic drive, interpersonal bonds, and the gritty logistics of self-publishing.