Yup, he was a member of Nippon Kaigi in Japan, a right-wing extremist group that has never been ashamed to share their nationalist views publicly including the denial of Japan's rape of Nanking, China. He had his fair share of enemies for those same beliefs, which included the desire for Japan to have the chains removed from them militarily so they can rise back up to the power they once were.
On a related note, I love Japan and have been there 6 times. Amazing food, wonderful people and endless unique neighborhoods to explore. Just don't stay at any hotels affiliated with APA - it supports the denial and refrabication of Japan's cruel history to the rest of Asia and is backed by hardcore nationalists like Abe.
https://www.ft.com/content/d35ec458-...c-f253db7791c6