Is it vegetarian? Any fish flakes in this miso?

It is not vegetarian. While it doesn't contain chunks of fish flakes, dashi (the broth powder) is made with fish (bonito).

What is the nutritional content, including sodium?

Sorry for my delay: 35 Calories from Fat, Carbohydrate, 3g, Sodium 740 mg, 31% of %Daily Daily Value, Dietary Fiber 0g & Sugars 0g, Protein 3g, all listed in English, & Japanese Characters, taste is a good treat, I love having it at breakfast or as a snack. Worked for Hitachi Sales Corp. of America for 16 years, went there for a month 3 times, VCR Factory Training, '79, '81, '83 in Mito. - Tomu is my nickname

How mant total servings are there? What does 9 pockets in 3 packs mean?

3 pockets or individual servings in pack. 3 packs to purchase. Total of 9 individual servings.

What are the ingredients and why would someone buy It without knowing?

INGREDIENTS: Red and White Miso Powder (Soybeans, Rice, Salt, Riboflavin), Maltodextrin, Dehydrated Tofu (Soybeans, Calcium Sulfate) Dehydrated Seaweed (Seaweed Maltodextrin, Salt,) Kelp Powder, Monosodium Glutamate, Bonito Powder (Fish), Salt, Dehydrated Green Onion, Hydrolyzed Soy Protein, Mackerel Powder (Fish), Disodium Inosinate, Disodium Guanylate. Any questions, contact Kikkoman Sales USA Inc., San Francisco, CA 94111