The drama is based on a blog written by Baka Rhythm between 2006 and 2009 where he posed as a OL nicknamed Kakuu Masuno (meaning fictitious + Baka's real surname) who supposedly worked in a bank and wrote stories about the daily feelings of a OL from her perspective and the people around "her" such as Maki-chan who has such well-defined abs thanks to her training at the gym that she got mistaken as a staff there, naive junior Sae-chan, meticulous senior Noriko-senpai and her manly senior Komine as they gossiped and complained about various topics. As the stories had such a strong realistic touch and were so compelling, the readers didn't feel like it was something which a man was capable of writing. The entries were later compiled and published into a book.
Kaho will be playing Maki-chan who is a gym freak and boasts of washboard abs while Usuda Asami will be playing Komine who behaves like a man. Yamada Maho will be playing Noriko-senpai and Sato Ryo will be playing Sae-chan.