Chisato lives with her daughter and her husband. She lived in harmony with her family of three. Chisato, who had been awake in the middle of the night, noticed a sound leaking from her daughter's bedroom. When she peeks secretly, her daughter and her husband are working. She returned to her room, thinking that she was on good terms with her. However, Chisato was aching her body for the work that was done every night...
