You can read the first 13 chapters of Just Cause here, or read the webcomic version here.
My supporters on Patreon can read chapter 14 today.
As the smoothness of the carefully-carved path gave way to the harsh edges of a small mountain, and a gust of wind turned the tunnel ahead into a shrieking maw, a surge of adrenaline and dread turned Frisk’s pulse into a pounding tide.
The dull red glare of the firelit ceiling loomed high above, turning the buildings and machines into ominous silhouettes, and closer – far, far too close – a smaller but vastly more perilous figure stood motionless on the mountaintop.
A spark of anger flared through the fog of fear, and this time the curl of their toes whispered of a desire to use the shoes they gripped for a purpose other than running away.
The edge of pain in the monster’s voice cut through the haze of rage like a spear, and the memories that followed it warped what remained of their indignation into gut-twisting guilt.
It was clear that Undyne was going to wait until Frisk made the first move. Still, the human hesitated, caught between a retreat that offered no escape and a battle they didn’t know how to wage.