Just binged this.
(More like skimmed through the last 7 chapters to be fair.)
Came for the demon lady with an interesting dynamic and she was barely in the story. This chapter seems to finally start something involving her, so I hope we see more.
Because so far it was : "Hey! Did the Demon Girl peak your interest? Great! Here's this cute Fire Isekai Girl we're going to focus on for the whole first TWO VOLUMES!"