"I'm sorry... I'm not feeling well," Mimi murmurs one Saturday morning in front of her husband and son. The couple had planned to go to an amusement park, but noticing Mimi's sudden change, they worry and decide to postpone their trip. While they're away, Mimi tries to rest at home. A few minutes later, Saburo, her secret lover she met at her part-time job, arrives. Usually they sneak around to meet in secret, careful to avoid her family, but today they decide to spend the entire day together at her house before her family returns. With no need to rush, they can finally be honest with each other. To fill the emptiness in their hearts, the two choose to quietly lose themselves in each other at home.