Yea SG girls are really bad if you want to S rank the map not advisable for a starting team. Im using the free 4* SG girl, her skill is somewhat useful activating most of the time when the enemy is in her range and it hardly misses. I did pump her hp tho, feeding every 1 and 2* girl that has hp bonuses and equipped her with defensive gears.
I actually tried 3-1 to 3-7 just to see what the drops are. Currently trying to 100% 3-2 then going back to 1-1 with my 2nd team when my main needs to go to the infirmary (I rather get event medals than go wait for my main team to recover).
So far I collected about 1830 medals, and I still dont have any ideas when the event will end.
EDIT : this is my progress as of this time
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