Returning home from shopping, Yuka finds a cell phone at the entrance—coincidentally belonging to Sato, her husband Hiroki's senior from high school. Overcome with nostalgia at their unexpected reunion, they share drinks and reminisce about old times. But when Hiroki passes out from drunkenness, Sato suddenly changes his demeanor and makes a bold move toward Yuka. In an instant, the atmosphere shifts from warmth to intense tension.