Bring a small pot of water to a boil, then gently place the eggs into the boiling water and cook for 10 minutes.
When time is up, turn off the fire then discard the boiling water and immediately soak the eggs in cold water for 5 minutes so they can peel easily.
Peel the eggs, removing any bits and piece of eggshells, then place them into a medium-sized bowl.
Using a fork, mash the hard boiled egg into small pieces, then add Kewpie mayo, heavy cream, black pepper, salt and sugar. Adjust measurements according to taste then mix until well blended.
Place half the egg mixture between 2 slices of bread, preferably milk bread (even better if spread with butter). Repeat the process with the remaining egg mixture and sliced bread.
Flatten the sandwich gently with your palms, then remove the crusts and cut in half. Enjoy!