Towers rise across the world and pour out monsters, and the Tower Walkers who climb them earn one desperate out. At the edge of death, a regression stone sends a Walker back in time, but only into a new branched timeline that abandons the original. Jaehwan refuses the stone. Choosing to stay and fight for the world he started in, the stubborn Tower Walker keeps climbing the Tower's floors and uncovering the secrets behind who built it and why.