Saki Kasukabe, a fashionable and assertive Shiou University student, enters the Genshiken club through her relationship with Makoto Kousaka, a devoted otaku she initially hopes to separate from the group. Her early hostility manifests in physical teasing and vocal contempt for the club’s hobbies, driven by disdain for otaku culture. A pivotal fire incident—triggered accidentally by her cigarette—destroys club materials, sparking guilt that reshapes her actions. She quits smoking, develops pyrophobia, and reluctantly engages in otaku activities as penance, including cosplaying a *Kujibiki Unbalance* character during a campus festival, marking her uneasy integration into the group.

Post-graduation, she builds a fashion career while maintaining sporadic ties to the club. Her dynamic with Harunobu Madarame, who harbors unreciprocated feelings, culminates in a locked-room confession attempt she deflects to preserve friendships, showcasing her matured emotional awareness. Pragmatic and occasionally manipulative, she balances sharp wit with vulnerability, such as tearful guilt over the fire or nostalgic reflections on her club days. Though never adopting otaku interests, she coins nicknames for members and aids their crises, acting as a stabilizing force.

Her relationship with Kousaka evolves from frustration at his obsessions to mutual respect, though she occasionally exploits his gaming prowess to haze recruits, reflecting lingering ambivalence. Beneath her critiques lies genuine concern for the club’s survival, often motivated by obligation or remorse. Later arcs position her as a mentor, mediating conflicts like Madarame’s unresolved emotions and discerning crossdressing member Hato’s identity before others. Her humor endures, evident in teasing Madarame about discovering his S&M materials.

Her narrative closes with professional success shadowed by nostalgia for college bonds, encapsulating the interplay between her growth and the enduring influence of Genshiken’s unconventional friendships.