
Miyata Ayaka (Renbutsu Misako), an office worker, sees her world collapse around her when her mother Miyata Harumi (Kikuchi Momoko) collapses due to illness and is left in a coma because of it. She then discovers that her mother kept a secret diary that she writes with her high school friends and that the lies she has told her have become evident, with nothing to lose. Ayaka will travel to Kaga, in Ishikawa Prefecture, her mother's hometown, to try to clarify the truth of the lie in her mother's secret diary.
Diary is a Japanese drama of 27,774 characters, with 2,188 unique words and 842 different kanji. Its difficulty rating on Jiten is average, 2.7 out of 5. The full vocabulary list ranks all 2,188 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.