Ankoku has been battling stage IV stomach cancer since early February 2017. On March 31, 2017, he had lost access to his Facebook account because an unidentified ex had placed a keylogger on his computer, and therefore found out his password.  The ex had then made a Facebook account, which has been deactivated since, posing as his cousin. On this account, he made a post claiming that Ankoku had passed away during a living donor liver transplant on March 31, 2017 at 6:57 PM JST. However, on April 19, 2017, Ankoku had made posts on Twitter stating that the post was not true, and that he was, in fact still alive  and had survived a deceased donor liver transplant. He had been bedridden in the hospital between March 31 and April 19, 2017, and therefore unable to access social media. Since then, he has returned and is posting regularly as of May 2017.
- Ankoku's about me on Facebook. Retrieved August 24, 2016
- Stomach Cancer Awareness - Periwinkle Ribbon - submission by Ankoku Yokohama on Fur Affinity. Dated March 5, 2017. Retrieved March 31, 2017.
- Facebook post made by Ankoku - Dated May 7, 2017. Retrieved May 19, 2017
- Tweet by Ankoku - Dated April 20, 2017. Retrieved May 19, 2017
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