Preheat oven to 375, with oven rack in center position.
Combine soy sauce, sake, mirin, ginger, garlic, and sugar in a small saucepan and boil until reduced to 1/2 cup, about 15 minutes. Transfer to a bowl and cool to room temperature.
Toss wings in bowl with oil and salt and transfer to a baking sheet. Bake for 45 minutes, glazing and turning the wings a few times in the last 15 minutes of cooking.
Serve warm with vegetable crudites.
