Yuya is mostly inclined to help because murdering people for dissenting against the tyrant is bad, actually? Nobody deserves this.

That said he's useless in a fight though he does have a shield as a holdout if necessary (and innocence magic he'll be Avoiding If Possible).

He is going to have a run-in with Bunny and get some of the names of the people targeted, so he can share that with other Pleroma so they know who to smuggle out. And otherwise will just follow any lead about where to take people/be ready to receive people at whatever safe place they have.