Fortunately, the simple negotiations in Last Bible III are much less daunting than Persona 2's were in terms of size, though LB3's negotiations are partially pieced together on the fly, which comes with a unique set of challenges.
On a side note, the enemies in Last Bible are called "beasts" (majuu) rather than "demons" (akuma).
* Note: Ironically, they were called "monsters" in the official "Demon Slayer" translation.
"Demons" do exist in the Last Bible world, but they only appear under certain conditions. (Play Last Bible II to find out more about that.)