6

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I gotta say, I kinda freakin love the idea of an isekai where the villains summon the heroes rival from his original world to come be his rival in this world!

So many isekai series, the fact that they come from Earth is hardly ever brought up again after the first episode. And other than genre knowledge or a vague desire to return home, it's mostly just an excuse.

I love that Animal Mask's old-world problems are following him here.