Yuko lives with her father-in-law at her in-laws' home, and she has been troubled by one particular issue in her daily life: her occasional visits from her crude and tactless brother-in-law, Keisuke, whom she strongly dislikes. One day, the entire extended family gathers to celebrate her father-in-law's 70th birthday, Keisuke included. During the party, Yuko finds herself internally conflicted, yet distracted by Keisuke's unexpectedly innocent behavior. As the night deepens and everyone becomes increasingly drunk, Keisuke suddenly approaches Yuko with a flushed face. The atmosphere instantly grows tense.