Confronted with impending defeat and inevitable death, would you opt to flee—or persist in fighting for a world destined to fall? As enigmatic towers emerge globally, conjuring beasts that hunt humanity, this dilemma is posed to the Tower Walkers: adventurers endowed with unique abilities to combat these creatures. Near death, they may elect to utilize a "regression stone" to revert to the past for another opportunity, albeit this choice strands them in an alternate timeline permanently. The resolute Tower Walker Jaehwan spurns this option, opting instead to battle for the original timeline, and uncovers startling truths regarding the Tower in the process.