The setup isn't very restrictive, and she still has a lot of control of movement on her legs and hands. Despite that her neck and waist restraints would keep her from moving out of the abdomen restraint.

Her legs are disproportionately large compared to her torso, where we can see her ribs are visible. From this we can assume she's lost weight quickly and hasn't been captive long enough to lose muscle mass from inactivity. This means she's being starved and won't have much strength. Despite the thin, unbraided ropes, she won't be able to break out with brute force.

However, the captor made a critical mistake, the spare dildos are within grabbing distance. Here's how she will escape:

She can't use her hands to grab them because the ropes on her arms aren't long enough to slide the dildos off the rack. Instead she'll have to move one leg back, and pull one of the dildos back with her toes. Once it's out, bring it within grabbing distance of her hands, pick it up and repeat with the second dildo.

Wrap the connected metal rods on the dildos around the lines connecting her hands together, on opposite ends of the bar, so she can twist with one hand and hold the other end still. The ropes look to be about an inch in diameter, and would be doubled at 2 inches when twisted around itself. The rods look about 8 inches in diameter.

8in. x Pi = 25.13

With every full twist of the dildo she'll move her arms 25 inches and apply it over 2 inches of movement, multiplying the force applied by a factor of 12.5.
Even with a weak and tired Satori, the leverage generated should be more than enough to break the thin rope connecting her arms together. The reason we need both dildos is because without one dildo to hold the rope down on one end, the force would have broken her wrist.

Does this mean she can repeat the same process on all of her restraints and escape now? Not quite. Freeing her arms is a good starting point, and while it does allow us to repeat the process on the rope holding her neck, the feet and the abdomen restraints are a problem. Remember, this whole time she's been in a dildo torture machine, although having no seat gives her more movement options, it also makes movement a lot more dangerous. Twisting around to break the thin chains holding the abdomen restraint in place could seriously injure her.

Thankfully there's a simple solution to this. However, before I can explain the solution I have to explain what the machine does and how it (most likely) works. The dildos are moving up and down, over and over, this is called reciprocating motion, or back and forth motion in a single line. The machine’s small size tells me it is most likely electronically powered, as there wouldn’t be enough space for a combustion system. Back and forth movement is already achieved by default when using a combustion piston system, but since this machine is electric it would instead use rotating motors and convert that force into linear motion through either a crankshaft or a gear driveshaft. A crankshaft can create linear reciprocating motion just by moving in one direction, but a driveshaft would need the motor to change directions with the dildos.

Why is this information significant? If the machine uses a crankshaft system we can place the dildo’s metal connector rod under them to jam or even break the machine.

If Nitori is the one responsible for all this she might’ve just quickly made a rudimentary gear driveshaft that switches motor direction constantly instead of designing a more efficient one-way crankshaft system. Although there aren’t many hints as to who the captor is I feel confident Nitori isn’t one of them. Someone as mechanically proficient as her wouldn’t have used these inefficient restraints. Since she has difficulty making magic tools she would be experienced in conventional systems, like rope knots. This rules out the chance of the machine being a quick and dirty hack job, and instead a purchased, manufactured item.