I did a second playthrough precisely to pursue just one of them in order to have just one girl to save from the fire, and thus not letting anyone burn to death, but no matter what you do: they are both there, both of them passed out in the arson.

So no actual good ending is possible, and this is dumb.
"Life ain't easy"... stupid DPC.
I get that in life nobody is gonna have all they want and experience loss,
BUT in 98% of the cases the death of a beloved one is
NOT caused by a rejected sociopat... And in 99.99% of the cases one isn't forced to decide who to save and who to let die...