Well, apparently, Yuzu doesn't even have to take part at internationals, if it comes to that. He becomes one of the seeded skaters along with Shoma, Keiji and Takahito. And that was an exceptional decision the JSF made concerning Yuzu - that he's already in though technically, he's not a last season's Japanese medalist.
http://www.sponichi.co.jp/sports/news/2017/05/14/kiji/20170514s00079000212000c.html