Two weeks after her husband transfers to a regional branch, Ayaka worries as he struggles to fit in. When she hears that his subordinate Yamashita is living alone after his wife left him, she brings over food to cheer him up. Moved by her kindness, Yamashita loses control and kisses her passionately. Their tongues keep tangling until Ayaka is swept away by the heat and kisses him back. Before long, they are touching each other's intimate places and slipping into an affair.