Kawamoto was born and grew up in Okayama Prefecture. After her marriage, she relocated to Sanyo-Onoda City, Yamaguchi Prefecture. She never drove a car, opting to walk everywhere she needed to go. She disliked no foods.
Kawamoto took up calligraphy aged 84. At the age of 109, one of her works was made into a hanging scroll and sent to the city mayor.
As a supercentenarian, Kawamoto lived in a nursing home in Sanyo-Onoda; she could still eat independently aged 110. She was presented with a congratulatory tribute by the mayor for her 112th birthday, which included gifts and a bouquet of flowers.
Kawamoto died on 29 September 2015 at the age of 112 years, 167 days.