Sumire relies on her husband, who is currently undergoing treatment for illness. One day, Kawano, her husband's former subordinate and senior colleague, visits from afar to check on him. However, at that moment, her husband is in a deep sleep due to medication side effects. Knowing the drugs will wear off and he'll regain consciousness by morning, Sumire asks Kawano to stay overnight. What events will unfold between the two that night...?