Maki, a Maki, is amazed at her husband's obsession with shogi, and is happy that he spends his days playing with his nephew Masato. One day, her husband is suddenly called to work, leaving her alone with Masato... Masato, who has always had a secret lust for Maki, cannot resist her defenseless sex appeal and takes the opportunity to push her down. Maki resists, but since she has not had sex with her husband, she unconsciously feels lust for his strong body and accepts him as he is. From that day on, the two's hidden sexual desires run wild, causing a great upset in their daily lives...