TOKYO/GUANGZHOU -- "Goodbye, my beloved and precious mom. Life, work and everything is painful."
After sending this message to her mother, Matsuri Takahashi, then an employee at Dentsu, Japan's largest advertising agency, threw herself from a company dormitory in Tokyo on Dec. 25, 2015. Her suicide was later officially recognized as a case of karoshi -- death from overwork. Japan's karoshi law covers both suicides and deaths from illness caused by overwork.