She died on 8 February 2017 at the age of 18. Matsuno was unable to perform at her group's concert the day before due to a health issue and was taking medical treatment at home in Tokyo. In the early morning on February 8 her condition suddenly worsened. At around 5 am her parents called the emergency services. She was pronounced dead at the hospital. It is presumed that she died from an illness. In her last post on Instagram on February 6 she said that she had returned from a family trip to Hakone.