Enemies: Crow lvl 5 x4
Familiar lvl 5 x2
Manticore lvl 5 x1
Much of this stage is dominated by a huge, spiraling staircase. From the top, a Manticore and two Crows move down towards you. At the base level, two more Crows and two Familiars stand ready.
Take out the ground monsters first with combo attacks and set up your forces near the base of the stair, waiting for the other monsters to come to you. Hardier units, such as Hana, Flo, or Cookie Men, should be in the front, with fragile spellcasters like Yuki, Elementals, and Dryads behind them. Chances are good that the flying Crows will pull far ahead of the Manticore and fly over your strong characters to get at the squishy mages; pelt the Crows with spells the moment they come into range and try to eliminate them before they can do any lasting damage to your team.
Hopefully, the Manticore will not reach you until all the other enemies are gone. He's huge and powerful and can heal himself at your expense with the Ravage skill, but his health and defenses are lower than the Bahamut's, making him easier pickings. A handy Defense Down Force Line streams away from the bottom of the stairs, too; position your forces just behind its flow and the Manticore will likely stand in it to attack you, further weakening him for your fighters.