Prepare the Broth: Combine chicken broth, water, soy sauce, mirin, sake, ginger, garlic, and kombu in a large pot.
Simmer the Broth: Bring to a simmer over medium heat, then reduce to low. Simmer 30–60 minutes.
Cook the Eggs: Boil eggs for 6–7 minutes. Transfer to ice bath, peel, and halve.
Prepare the Noodles: Cook noodles per package instructions. Drain and rinse with cold water.
Strain the Broth: Remove ginger, garlic, and kombu. Stir in sesame oil.
Assemble the Ramen: Divide noodles into bowls.
Pour in the Broth: Ladle hot broth over noodles.
Add the Toppings: eggs, green onions, bamboo shoots, corn, and nori. Garnish with sesame seeds and chili oil.