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Yuta's book, an autobiography, is scheduled for release tomorrow.
So far, I think it's only available in Japanese. (Available on Japan's Amazon site). Hopefully, a translation is forthcoming.
https://www.commercialappeal.com/story/sports/nba/grizzlies/2019/10/08/yuta-watanabe-grizzlies-forward-japanese-star-now-author/3895720002/
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Seeing this post, I googled to see what the latest was with Yuta. Found this article. Not sure if it was shared in another post, but a great read for sure.
https://www.sbnation.com/2019/9/5/20849363/yuta-watanabe-rui-hachimura-japanese-basketball-future