User blog comment:IamJakuhoRaikoben/Chapter 348: Return of the Demon, Review./@comment-8153438-20130824124819

My guess about next week's title is: a new enemy? like a devil tree or something. It can also be about Minerva's companion..

And the eternal flame must be Atlas Flame's body or something related to him. He mentioned in Chapter 333 that his flames were "Flames of Titan that bellow violently than those in hell."