With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The manga (Japanese comic book) and anime series "Hikaru no Go", released in Japan in 1998, had a large impact in popularizing Go among young players, both in Japan and—as translations were released—abroad. "Go Player" is a similar animated series about young Go players that aired in China. In the anime "PriPara", one of the main characters, Sion Tōdō, is a world renowned Go player, but decides to retire as nobody has been able to beat her, becoming an idol instead. Despite this, Go still features heavily in her character's personality.
text_B: Did Sion Tōdō retire while undefeated?
YES.