In 1922, Arishima met Akiko Hatano, a married woman and an editor working for the Fujin Koron, a famous women's magazine. Their relationship quickly developed into an extramarital affair, which came to be known by Hatano's husband. This led to Arishima and Hatano committing suicide in Karuizawa by hanging themselves. Due to the isolated location, their bodies were not discovered for over a month, and were identified largely by the suicide note left behind. Arishima's grave is at the Aoyama Cemetery in Tokyo.