You get Io(Episode 4) Partner Card Along With Io(Episode 2)

Clearing [Perfect Attack Boot Camp VI] grants you Io's partner card. However, you get both versions of her at once. Episode 4 is not released yet.

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No problem, Pietro is an episode 4 character too 😄

Naturally. In this case though Io is an Episode 2 character. Pietro and Summoner were specifically integrated with EP3 content. So that's normal.

Once again these things don't matter a lot. It's just my duty as a player to report small things.