It has been confirmed in a tweet posted by an August Soft employee that illustrator Torishimo died on February 20, 2017. A funeral was held four days later, on February 24. The reason for his death has not been revealed.
Oh man, I remember watching fragments of Dokuro-chan when I was like 12. It was silly but also kinda mind blowing for me back then. Sad to see he haven't created anything as popular ever since it ended :< May he rest in peace, I'll definitely come back to Dokuro-chan one day.