Low-carb buns are buns with about 50% less sugar than regular "Goma buns". By replacing part of the ingredients with dietary fiber, the sugar mass per piece is reduced from 28.3g (0.11oz) of sesame buns to 14.7g (0.25oz). In addition, calories are cut by about 40% from the conventional 203 kcal to 118 kcal, and contains dietary fiber (9.7 g) equivalent to about 3 lettuce. Some whole grains are used, and you can enjoy the aroma.
To give an example of changes in sugar mass and calories when changing to low-carb buns, in "Classic Cheeseburger", the sugar mass is usually 34.0 g to 20.2 g, and the calories are usually 529 kcal to 444 kcal.