Once the rice is totally cool, store leftovers in an airtight container in the fridge for up to 5 days. You can also freeze for up to 4 months. To reheat, place leftovers in a pan with a half tablespoon of oil over medium heat. Stir the leftovers until heated through; about 5 minutes. Add a splash of additional soy sauce to moisten the leftovers if things have gotten dry.