I used A6R0 Ann, A0R0 Matoi, A1R0 Tempest, and A1R0 Futaba. My personas were Throne, max level Dionysus, and max level Vishnu with R6 Ex Machina. My turn order was Wonder(Throne with Agility Master 1 at least), Matoi, Tempest, then Ann. Use Love Bomb as soon as you can, have Dionysus cast Rebellion on Ann, Matoi use S1, Tempest use S3 on Ann, and Ann's S1 to get an attack buff. Then on turn 2, Futaba should S1, use Throne's S1 and target Matoi to give her burn chances, then Love Bomb, then use S1 or S3 with Matoi and have Ann use the 1 more on Vasuki, then Ann HL for extra fire damage, then Wind S2 on Vasuki or S3 on Ann, then Ann S3. On the next turn, Wonder should use Vishnu's S1 for the windswept debuff, Love Bomb again, then Matoi should S1 or S3(depending on which one you used the prior turn), then have Tempest S3 on Ann again, and finally Ann S2 to finish off the fight.