As a 24-year-old woman, Ogata Makoto doesn't like to show her true self or draw attention to herself in her private life or when she is at work. This is because she doesn't want to be disliked. One night, Ogata Makoto had an accident. The accident causes her to lose the memory of herself. She finds a male ring in her bag, but she doesn't remember who she was going to give the ring to. Soon, three men appear in front of Ogata Makoto, and the ring fits perfectly on all three of them. One of them proclaims himself as her ex-lover, one man claims to be her only male friend, and the other man claims to be her man of fate. Each of them has their own lies.
Kishibe Midori (Ikeda Elaiza), an editor for a popular fashion magazine, finds herself transferring to the lexicography division following the magazine's discontinuation. The place is filled with a group of quirky characters, led by Majime Mitsuya (Noda Yojiro), a boss with a shaggy hair who is extremely serious. While being tossed about by them, Midori is influenced by their patience and passion for making a dictionary which takes over a decade, and she gradually immerses herself in the work. This drama depicts their struggles in creating and finalizing the dictionary, "The Great Passage."