Saki got married to her boss, Construction, who listened to her wish to continue working after marriage. Although she was living a fulfilling life, she still felt a wall in her heart with her only son, Tsuyoshi. At that time, she was seen being molested by Tsuyoshi, who happened to be on the train. Tsuyoshi, who had a secret admiration for her mother-in-law who is close to her age, remembers her desire for Saki, who is not similar to her usual neat appearance. And a few days later, he quietly sneaks up behind Saki on her way home...
