Ah... no, I'm not really sure! But you could try asking Nine-Nine or Anubis? Ah, here.

[He pulls out his phone and shows Yugi their profiles]

Anubis and Nine-Nine had a similar relationship, where Nine-Nine was the one trapped in a necklace. And as you can see, they look the same, too.

You guys were friends back home, so they might be able to help you with questions like that. Uh... Assuming they remember. I'm pretty sure I saw Nine-Nine at the game but I haven't had a chance to touch base with him yet.