Non Oyamada is a 23-year-old office lady at Tokyo's Marunouchi-based Major Products during Japan's bubble economy, embodying the "oyaji gal" archetype through her embrace of middle-aged salarymen hobbies like golf, karaoke, and horse betting. She navigates her workplace with striking assertiveness, often directing managers and superiors instead of following conventional subordinate roles. This manifests when she orchestrates a "50th anniversary golf competition" for the 42.5-year-old company and persuades her boss to let her host a key client at a golf resort.

Golf anchors both her lifestyle and philosophy. She wears golf spikes while performing office tasks like making tea, declaring it symbolic of "walking on the fairway called life." Her dedication fuels critiques of younger generations treating golf as mere fashion rather than a serious discipline.

After hours, she pursues shopping, parties, and potential marriage partners through comedic, fragmented romantic escapades. One such vignette depicts her attending a colleague mixer followed by unconventional socializing with her manager.

Her core traits—confidence, workplace assertiveness, and unconventional interests—remain unwavering across the manga serialization (1989–1992) and 1991 OVA adaptation, with no documented character evolution.