Nanako suddenly finds herself working as a waitress at a café run by her husband's friend. On her first day, she is shocked by the scene inside. Couples are openly making out without caring about others, and lewd moans echo throughout the shop, dominating the atmosphere. Nanako quickly realizes this is no ordinary café—it's a "couple's café." Unable to quit for her husband's sake, she begins to feel an odd excitement from the sounds of pleasure around her. One day, when the manager is absent, a regular customer named Odategusa comes to the shop...