Keiko has never fit in, neither in her family, nor in school, but when at the age of eighteen she begins working at the Hiiromachi branch of “Smile Mart,” she finds peace and purpose in her life. In the store, unlike anywhere else, she understands the rules of social interaction―many are laid out line by line in the store’s manual―and she does her best to copy the dress, mannerisms, and speech of her colleagues, playing the part of a “normal” person excellently, more or less. Keiko is very happy, but the people close to her, from her family to her coworkers, increasingly pressure her to find a husband, and to start a proper career, prompting her to take desperate action…