黒龍会
The Japanese had been trying to unite anti-Manchu groups made out of Han people to take down the Qing. Japanese were the ones who helped Sun Yat-sen unite all anti-Qing, anti-Manchu revolutionary groups together, and there were Japanese like Tōten Miyazaki inside of the anti-Manchu Tongmenghui revolutionary alliance. The Black Dragon Society hosted the Tongmenghui in its first meeting. The Black Dragon Society had very intimate, long term and influential relations with Sun Yat-sen who sometimes passed himself off as Japanese. According to an American military historian, Japanese military officers were part of the Black Dragon Society. The Yakuza and Black Dragon Society helped arrange in Tokyo for Sun Yat-sen to hold the first Kuomintang meetings, and were hoping to flood China with opium and overthrow the Qing and deceive the Chinese into overthrowing the Qing to Japan's benefit. After the revolution was successful, the Japanese Black Dragons started infiltrating China and spreading opium. The Black Dragons pushed for the takeover of Manchuria by Japan in 1932. Sun Yat-sen was married to a Japanese, Kaoru Otsuki.