Based on the provided information, the "Office Lingerie" series features no character named "Nayumi". Its documented characters include Yusuke Nakanishi, Rena Asaoka, Alice Nonoyama, Chisa Sakurai, Mayumi Fujiyama, Yukio Zaitsu, and Shinkichi Miki. Official media—spanning the anime adaptation, original game, and associated materials—references no major or minor character matching that name.

Mayumi Fujiyama, an employee at Best Beauty Body Inc. voiced by Yuka Inokuchi (also credited as Ayaka Kimura), remains unrelated to the name "Nayumi". Plot summaries, cast lists, and production credits for the OVA and source material further confirm the absence of any "Nayumi" character.