Responses
So the witch is Waka in another timeline and she can use the powers of the IPO (shes just special like that). And IPO/Gods are just a large accumulation of what i think is energy/fuel. However, unlike IPO who dont have bodies she is limited in the powers she can use like saving Shion who died on the train tracks. So, she ends up making a deal with the devil to achieve her wish ^. The story hasn’t revealed much about Alula and why they were reincarnated into Waka, but i think it has to do with making Tokinaga have a physical reaction towards Waka.

Just what is Waka's wish that Tokinaga has to suffer this much?