The publication of a new dictionary titled The Great Passage progresses. Mitsuya Majime, originally from publisher Genbu Shobo's sales department, has been recruited by Kouhei Araki, a veteran editor of the dictionary department who is looking to retire soon. The dictionary department is known internally as the "money-eating insect," but Mitsuya uses his perseverance and attachment to the words in order to become a great editor. Mitsuya, who has poor social skills, finds himself working with another man named Masashi Nishioka, who is able to express himself better.

Majime, an eccentric man in publishing company, who has unique ability of words, joins the team that will compile a new dictionary, The Great Passage. In the eclectic team, he becomes immersed in the world of dictionaries. But the team is overwhelmed with problems.