Kiriwo as a human and in his madness is much more terrifying than Kiriwo in his demon form in the main manga series. So I think the place where Kiriwo meets Baal looks like a conference room.
In the main manga series: Iruma stops Kiriwo's bomb using Pandora mode.
In the Iruma If mafia manga series: Azz-kun and Clara find out where the bombs are, they have them and I think they throw them into the water/ocean.
In the main manga series: Kiriwo's barrier cracks and so the girl loses her accessory.
In the Iruma If mafia manga series: That little robot explodes and so that girl's pendant is destroyed.