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Did Natsuko post this because she knew she was retiring? Or did she post this because one of them is supposed to leave with Rossy?
"The rings are always connected" isn't something you say if you're retiring. Either Natsuko is leaving (and that would explain why she got one last title shot) or Utami is leaving and Natsuko thanked her, just like she thanked Giulia at Korakuen.