Should I aim to S rank every fight on my first playthrough? Is

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>>385094454
>Is it even possible?
It's possible, though some fights will be harder and will likely require multiple attempts, e.g. dwarf gunship battle.
>Should I try this at all?
Go for it, the game's overall pretty easy so the added self-imposed challenge is fun and not overwhelming.
>Does doing so unlock anything?
Additional rewards upon battle completion, does not unlock anything beyond that (trophies, optional endings, hidden bosses, etc.).