The wife had to urgently return to her hometown due to an unexpected job, so the guy in this movie told his wife to stay at her best friend Yuna Ogura's house to have someone take care of meals and not feel lonely living alone. Trusting her husband and knowing that they had known each other since childhood, being close friends for a long time, she also felt reassured to go. But little did she know that her husband still had no intentions of cheating on her, remaining faithful, while his best friend was extremely promiscuous...
After 10 days of living together, her best friend got pregnant.