How long has Passed since EC games in world? I know Justice says she's been there for centuries (though she's human, right?). Is the MC meant to be the same MC as in the EC games or different/descendant.

i don't think it's the same mc, because if remember correctly the mc in ec games was not human

He kind of went back and forth.

"though she's human, right?"

nope she is an elf and according to pink tea elf are immortal, so using the character's age is completely out of the question