In a large bowl, combine bite-sized chicken thighs, 2 tablespoons soy sauce, 1 tablespoon sake, 1 tablespoon mirin, 1 teaspoon sesame oil, 4 minced garlic cloves, 2 teaspoons minced ginger, ½ teaspoon salt, ½ teaspoon white pepper, 1 egg white, and 1 tablespoon hot sauce. Mix well until the chicken is evenly coated. Let it marinate for 15 minutes.
Add cornstarch to the bowl a little at a time, tossing until each piece of chicken is well coated and slightly tacky.
Heat peanut oil in a deep skillet or pot to 350°F. Fry the chicken in batches for 4 to 5 minutes, turning occasionally, until golden brown and cooked through. Transfer to a wire rack or paper towel-lined plate.
In a small saucepan over medium heat, combine 5 tablespoons hot sauce, ¼ cup honey, and 2 tablespoons butter. Cook for 2 to 3 minutes, stirring constantly, until the butter melts and the sauce is smooth and glossy.
Add the fried chicken to a large bowl and pour the hot honey butter sauce over it. Toss until every piece is fully coated.
Serve immediately while hot and sticky over cooked rice.