When he received the news that Oishi's raid ended in success, he was very delighted and committed suicide there (although Ono's grave is at Itaya Ridge, it is said that it was created by people years later.)
しかし大石の討ち入りが成功したという報を聞き、大野は歓喜してその場で自害したとするもの（実際に板谷峠に大野の墓が現存しているが、後世の人間に作られたといわれる）。