Position first Kiba at top right of base. Line up second Kiba with where base meets cabinet, placing it lower based on the curved Kiba variant. Find the upside-down heart shape on the cabinet and position second Kiba at its point. Locate the vault prompt to the right of the golden trim and vault up, sprinting forward on landing.
from my testing, I'm pretty sure *both* Kibas are RNG based but I'm not sure (1st one definitely is)
The first Kiba can be curved or flat with a slanted bottom (you need it to be curved)
Pray that your Kiba looks like this one (the one without the sharp edge) because I'm not sure if the other Kiba variant(s) work as well or work at all. Next, find the 3 lines in the floor marked in red. Go to the red line with a blue arrow and follow it straight until you reach the center of the floorboard shown (yellow line). Then, cut the beam in half *again* (pink line) and stand on the green circle (make sure you are pressed up against the Kiba)
After you stand there, look slightly to the right of the golden trim on the cabinet, and you should find a thin vault prompt. When you vault, make sure you sprint forward when you land (if you don't, you'll slide off and break both Kibas 😭)