
The drama is based on a blog written by Bakarhythm between 2006 and 2009 where he posed as a OL nicknamed Masuno Kakū, who supposedly worked in a bank and wrote stories about the daily feelings of a OL from her perspective and the people around her.
Kakuu OL Nikki is a Japanese drama of 65,745 characters, with 3,157 unique words and 991 different kanji. Its difficulty rating on Jiten is average, 2.1 out of 5. The full vocabulary list ranks all 3,157 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.