This save is legit and at the start of the new update,
I played through the update without using the Kami mode (since i was thinking about saving it for Kami fight) and the best way *i found* to fight is to make use of the instant combat skills when neither u suffer an ATK debuff nor the enemy has DEF/dmg reduction buff, for example : At the start of battle with Stan use Adrenalin > Gun Fu I > Move & Fire > infuse Kami on Jason and for Jason Fortune skill, Manila's first 3 skills are all instant and if all mentioned skills landed the enemy can only deal 0-2 damage to any character per hit, on next turn u can block with Manila and use Revolver with Jason then on 3rd turn use Gun Fu I > Move & Fire and cycle through this method also u can heal using Fast Recovery whenever yer hp is in critical state or when u need mp, the healing skill is instant too.
It was possible to win all 4 battles without using items and with 3-5 times using Fast recovery in total.
Though i understand the RNG could be a big factor in this and ppl don't really care about the combat, still i'm delievering in case u want to do it legitimately, the battles were hard fought in scenes and so *i think* the game-play should be.
don't forget to recover yer hp and mp as well as topping up on ammunition before leaving the place.
in the inventory there r 4 items that each increases her lv, i didn't use them since the higher the current lv the more exp needed for next one thus was saving them for later in game if things become extremely difficult, if u think it's time u can use them, Manila is lv 17 and getting her to lv 20 unlocks new skill