Marinate the chicken: Combine soy sauce, rice apple vinegar, brown sugar, ginger, minced garlic, sesame oil, and white pepper in a bowl. Toss in chicken pieces to coat. Refrigerate for at least 30 minutes.
Cook the rice: Rinse short-grain rice until water runs clear. Combine rinsed rice with water in a saucepan and bring to boil; reduce heat and simmer until cooked.
Prepare teriyaki sauce: In a saucepan over medium heat, mix soy sauce, rice apple vinegar, brown sugar, ginger, and garlic until dissolved. Thicken with a cornstarch slurry.
Cook the chicken: Heat oil in a skillet over medium-high heat. Cook marinated chicken until golden brown and cooked through.
Glaze: Pour teriyaki sauce over cooked chicken and stir to coat evenly.
Assemble bowls: Serve rice topped with glazed chicken and garnish as desired.