Someone asked me to post the team I used to beat LF2, I hope this post helps people to organize a formation, even if it's a little.
The first team it's pretty straightforward. The playthrough is very simple:
Spam S3 with Geto.
In the first turn with Miwa use S1 to save CE, then S2 to counter the boss, then S3 all the way (if you think one of the units is in danger use S2 again)
With Miguel use S1 in turn one, then S2 and keep using S1, it's not recommended you use S3 because the provocation is going to make the boss use both attacks in Miguel, and it hits hard.
With Gojo use S2 2 turns, then S3 (very important, gives you a lot of break, needed to avoid the Boss from ulting in the next turns) and then spam S1.
Nanami will enter after Gojo leaves, and if you're lucky, the boss dying will make you have ults before Gojo's debuff is Gone. It shouldn't take more than 15-20 turns IF you're unlucky.
The only Rec bit that isn't necessary is Gojo's, the others are strictly recommended, I don't know if you can survive without them.
The other team isn't much different, stall one turn with Toge & Miwa, and then do the same as the team before.
If you don't have certain units, you can tell me and I'll try to make a formation with the units you have. Keep in mind that 0.2 is required (I don't think it can be done without him) and that I don't have SummerJi.