Hiroko Katsuki is the wife of Toshiya Katsuki and the mother of Mari Katsuki and Yuuri Katsuki. Together with her husband, Hiroko runs Yu-topia Katsuki, the last remaining hot springs resort in Hasetsu.

Hiroko is a warm and friendly person who rarely ever seems troubled about anything. She is very supportive of Yuuri, greeting him enthusiastically when he comes home for the first time in five years.

(Source: Yuri!!! On Ice Wikia)

Yuri Katsuki makes his way to the Grand Prix ice skating competition as Japan’s top representative with his eyes on the prize. However, instead of celebrating, Yuri walks away defeated and ready to retire for good. But a run-in with champion Viktor Nikiforov and rising star Yuri Plisetsky ignites a new fire within him. With the two of them close by his side, Yuri will take to the ice once more.<br><br>

(Source: Funimation)

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A side story manga was published as a bonus item included with the final Blu-Ray volume of the anime series, and follows Yuri Plisetsky and Otabek Altin the night after the Grand Prix Final.