In 1964, Momoko came by herself to Tokyo from her hometown. She met Shūzō and married him. They raised two children together, but Shūzō suddenly passes away. Momoko is dumbfounded by being alone again. She begins to go to the library and borrows books. This changes her life.

Modeled on Setouchi Jakucho, Inoue Mitsuharu, and his wife, 2 women depicts the special relationship between a man and two women, based on the novel by Inoue Areno, the eldest daughter of Inoue.

The film is a slapstick action comedy about company employees, known as "underground employees," who secretly handle problems that cannot be solved in public. The story unfolds when the group receives a mission to demolish a shuttered shopping district in order to build a commercial complex. Also appearing in the film are underground employees of rival companies with the same mission, a large landowner who is the target of both companies, a passionate man trying to revive a shopping district that is on the verge of collapse, and a man with some kind of secret.

Two different students—a successful but aloof academic and a rebellious but kindhearted delinquent—form a friendship through their love of jazz music.