
Yū Amagi is a slightly eccentric detective who has been assigned to the Twelfth Section of the Tokyo Metropolitan Police Department's First Investigative Division from the Lost and Found Centre. The Twelfth Section is called the "graveyard of detectives" and ridiculed as the "banishment room where hardened detectives who cannot be fired are sent." Its assembled detectives Kōsuke Samura, Takumi Yamashita, Keita Nagasawa, Tamaki Mizuta, and Masatoshi Katagiri are elite and yet oddballs. Amagi appears fixated with time which seems to have no relation with a case. Raising questions about the timelines of the perpetrator and victim derived from the estimated time of death, time of crime, time of alibi, and time limit, he searches for the meaning of "blank time" which arises from this. He obsesses over the weight of every minute and second of time because of some incident.
Keiji 7-nin is a Japanese drama of 554,230 characters, with 15,452 unique words and 2,102 different kanji. Its difficulty rating on Jiten is hard, 3.7 out of 5. The full vocabulary list ranks all 15,452 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.