Hi Noriko, it's difficult to advise you about your particular recipe, but a pinch of yeast isn't likely to be enough to give you light and fluffy results. In addition, the rice and oats and potatoes could be contributing to a denser result, since these are heavier ingredients that don't develop gluten. You might want to start with a recipe that is known to deliver light and fluffy results, like our Japanese Milk Bread recipe, and then modify your recipe using some of these elements. For example, this blog post gives some tips on how to add a tangzhong starter to your recipe. 

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