Momo Sakura stars as a newlywed nurse whose "overtime" at the hospital hides a dark secret. The story focuses on the 12-hour period when she doesn't return home, claiming to be on duty in the late-night ward. While her husband waits, Momo undergoes an abrupt transition from a dedicated wife and professional to a woman losing herself in the hospital environment. Driven by a desperate need for a physical connection she can't find at home, she surrenders to a relentless encounter that fills the "blank" in her schedule.