How Did Akiyuki Nosaka Die?

Akiyuki Nosaka was a Japanese novelist, journalist, singer, lyricist, and member of the House of Councillors. As a broadcasting writer he used the name Yukio Aki and his alias as a chanson singer was Claude Nosaka . He wrote the short story "Grave of the Fireflies" based on his experiences in the wake of American bombing during the Second World War; the short story has been adapted into both an animated film and a live-action film.