Hi there sorry to bother again,judging from official art of chapter 5 and what happens in the chapter, she has armor and protection on this arm to prevent her most likely to get burn by the fire of the demonic katana

Honestly you could just send me a DMail instead of creating comment chains on new Hoshimi Miyabi posts I upload to discuss anything regarding the arm and whatnot. You already started a comment chain on another post, there's no need to keep creating new ones on new posts. It's harder to have a single continuous discussion if you break it up by adding to new posts.

Previous conversation chain if anyone is following it: comment #2476311