1. Cook the short-grain rice in a pot. Pre-grease it with olive oil to prevent sticking to the bottom.
2. Cut the chicken fillets into small cubes, slice the onions and garlic cloves, beat the eggs in a bowl.
3. Marinate the chicken cubes in a bowl filled 1/3 with soy sauce and sake for 2-3 minutes.
4. Fill half of a frying pan with water and bring it to a boil with the soy sauce used to marinate the chicken (excluding the chicken itself), garlic, and sugar.
5. Once it boils, add the chicken and onions, and simmer on low heat.
6. After 7-8 minutes, add the beaten eggs, do not stir, and simmer for 2 minutes on low heat. Season with salt and pepper.
7. Serve over cooked short-grain rice in a large bowl or deep plate.