Enemies in Area 7 you will notice that they are stronger than Combat Power shown in the map. Even with 5x links, after few battles, your echelon will take some serious damage. For manageable missions, do not slack on skill levels and equipment enhancements and calibrations. If you are looking to S-Rank an Area 7, I am assuming you have least a 1 Full Echelon full of level 90+ and 5x links with a decent gears to back up the T-dolls. If you are below this setup, more grinding is recommended.
Another thing to keep in mind for Area 7 is that enemy units will have even more random movements. [compared to previous areas] so in unlucky cases S-rank will be impossible. In most cases an adaptation of guide below will be required. On top of that turn limits will be tight so if you don’t achieve your S-rank on first try, don’t fret and retry.
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It is important to be flexible in mission due to Girls Frontline does not have fixed enemy movements. So adopt accordingly.
I am using pictures with Korean language on them. Numbers next to arrows indicates movement order. Number on top left of the picture indicated what turn it is in.
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7-1
S-Rank condition: Kill 7 unit in 3 turns; control enemy HQ.
Required Squads: 2 + 1 Friend Echelon [or 2]
*** S-Rank might be impossible depending on Enemy Movement***
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7-2
S-Rank condition: Kill 6 unit in 3 turns; control enemy HQ.
Required Squads: 2 + 1 Dummy HG
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7-3
S-Rank condition: Kill 6 unit in 3 turns; control enemy HQ.
Required Squads: 2
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7-4
S-Rank condition: Kill 6 unit in 2 turns; control enemy HQ.
Required Squads: 2
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7-5
S-Rank condition: Kill 9 unit in 4 turns; control enemy HQ.
Required Squads: 2 + 1 Dummy HG
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7-6
S-Rank condition: Kill 10 unit in 5 turns; control enemy HQ.
Required Squads: 2
Emergency Difficulty
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7-1E
S-Rank condition: Kill 6 unit in 3 turns; control enemy HQ.
Required Squads: 2
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7-2E
S-Rank condition: Kill 6 unit in 2 turns; control enemy HQ.
Required Squads: 2
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7-3E
S-Rank condition: Kill 10 unit in 4 turns; control enemy HQ.
Required Squads: 2 + 1 Dummy HG
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7-4E