Who was the man in real life in the sound of insects?

In "The Sound of Insects," a novella by Japanese author Yōko Ogawa, the man at the center of the story is based on a real-life incident involving a man named Kōji Kōda. He was a 44-year-old man who retreated into the wilderness and recorded his final days through audio journals before taking his own life. The story explores themes of isolation, despair, and the human condition, reflecting on Kōda's experiences and thoughts during his last moments.