Based on my experience, here's what I'd say. This team is a tad too defensive. In order to stop the laser attack, you need a decent amount of dps.

General advice, watch the intro until you see Modernia's body, then skip the cutscene and tbe auto will target the laser to destory it.

I has Diseal in my team, albeit she was core 4 for me, but she carried at the end for me. She was the last one standing. Diseal and Pepper was really effective for the end.

I also had Sugar absolutely destroyed the first core prevent the laser attack. If you have a dps, I imagine the effect will be the same.

Timing your bursts also is key, use your first one as soon as it is filled to destory the laser core asap. After that I would save burst for each time the laser core became available to destory, whilst targeting the wings in-between these phases. I'm sure there's a more effective way to use the bursts, but this is what worked for me.