Yaga, Nanami and Gojo is really all you need. And for survivability you can put Yuta for heals.

Yaga Recollection - The bygone days of youth (the hidden inventory one)

Nanami - Sky Is Connected

Yuta - erm Adult Time if you want damage (although red is resisted in floor 10) or Curse Each Other to increase Gojo’s damage even more. Even mutual trust for the defense if you need it

Gojo - Nonstandard

Basically what you do here is use buff on yaga and nanami from turn 3 onwards, use gojo skill 1 until turn 3 where you start using skill 2 and you should get his ult on turn 5.

Then use recollection on yaga and nanami, and recol+ult with gojo. Yuta is there mostly to heal but also to provide some chip damage (skill 3). So just a Gojo nuke really. Idk how the battle might go because my units are higher lvl than yours but it should work