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 because she always wins, becoming an idol instead. Despite this, Go still features heavily in her character's personality.
text_B: Did Sion Tōdō retire while undefeated?
YES.