Arika, a married woman living an ordinary life, lives with her husband's younger brother, Masato, who came to Tokyo to become a stage actor. Her husband comes home late, so Arika often spends dinner with Masato. One day at dinner, Arika hears Masato say, "I have a kissing scene in my audition, but I have no experience and I'm worried." Having had too much to drink, Arika thoughtlessly offers to be his practice partner. But the moment their lips touch, she is overcome by a numbing sense of guilt...