Why did Utaoki die?

The studio didn't say why Utaoki died, only that he died for some reason. It is also said on the internet that it is because of depression, and the real reason is still unclear.

Utaoki Studio published an obituary on the 27th, and singer-songwriter Utaoki died on the 24th at the age of 22. In 2009, she published her work online.

It happened so suddenly that many fans couldn't accept it for a while. More news can be found in U C? Look at the title