Harumi Tanigawa appears in the OVA "Women at Work," originating from an erotic video game adaptation. She works at Hiroko's construction site, where her duties include preparing meals and beverages for the workers, such as cooking tea for Hiroko and supplying lunchboxes during breaks.

She possesses a slim, pale young-adult physique with shoulder-length straight brown hair featuring v-shaped bangs and brown tareme eyes. Her typical attire is office wear: a blouse and a ribbon tie.

Harumi is characterized by significant clumsiness and an airheaded personality. This trait causes notable accidents, including tripping and falling onto the male protagonist Akiyoshi immediately following his encounter with Hiroko. During this fall, her mouth contacts his erect penis. She subsequently asserts an ability to assess health status through semen taste, diagnosing Akiyoshi with iron deficiency. Her documented appearances remain confined to the original OVA and its direct source material.