Adapted a couple of different expert comps for this, prints could probably be more optimized though. Clear times generally range from 3:36 up to 4:15. Basically this comp can knock down Asura before second Divinity Slayer.
Mascula definitely can do with a better portrait print, and Yuki might be able to benefit from some Dragon Time for Bahamut to ensure he can get his lv 3 Cataclysm Beam off for optimal damage and lv 3 Strength Amp uptime. I run Yuki with 100% skill prep so she can ramp up Monkey Overdrive straight away.
Consistency is 100% so far out of 30 runs, but your mileage may vary. All facilities and weapon bonuses are maxed out for units present, but Mascula uses shadow Agito because I don't have all slots unlocked on his Water Agito (probably not necessary anyway). Share Skills are Gatov's and Mym's, but they're generally flexible.
Ran at 2x Auto, shapeshift on.
I should note that if you don't have Bahamut or Arsène, you can also get by with Gala Nidhogg (or High Chthonius on lead), but your mileage may vary. I don't have Gala Zethia but I presume having her in place of Gala Mascula might help speed things up further.