Bring a pot of water to a gentle boil
Lower eggs into the water carefully
Cook for 6 to 7 minutes for soft-boiled yolks
Transfer eggs immediately to an ice bath
Let eggs cool completely
Peel the eggs gently
Mix soy sauce, mirin, water, and a little sugar
Place peeled eggs in the marinade
Refrigerate for at least 4 hours, preferably overnight
Slice and serve with ramen