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I know those partners can dumb and a pain in the behind to keep alive due to their stupidity. However there is an incentive to get an S-Rank with them alive. If an S-Rank is achieved in any "Free Mission" with them alive than you might randomly get a "Photon Art" from them. Of them you can't buy in the store. Just do the easiest "Free Mission" until you receive all of them. ^_^