In a pot (not heated), add the kanten or agar agar.
Add a little bit of water and mix very well. Keep adding the water little by little and mixing until the agar is completely dissolved.
Once the agar is dissolved in the water, turn on the heat and bring to a boil, while stirring constantly.
Reduce the heat to a simmer and simmer for 2 minutes, while stirring constantly.
Remove from the heat and place in a flat rectangular container to cool. Refrigerate for 2 hours to solidify the jelly.
In a small bowl, combine the soy sauce and rice vinegar for the nihaizu (sauce).
Once solidified, pop the jelly out of the container and cut into chunks that will fit into your tokoroten noodle press.
Make the noodles using your press, directly pressing them into your serving bowls. If you don't have a press, you can cut the noodles by hand.
Pour on the sauces over the noodles, add your toppings, and enjoy!