Yes, in Japan, it is common for people to pour soy sauce over rice as a seasoning. This practice is known as "Shoyu-dare" or "Gohan-dare," which translates to "soy sauce over rice" or "sauce for rice."
In Japanese cuisine, rice is a staple food and is often served plain. To add flavor and enhance the taste of the rice, people will drizzle or pour a small amount of soy sauce over the rice. The soy sauce provides a salty and umami-rich taste, making the rice more flavorful and enjoyable to eat.
However, it's important to note that the amount of soy sauce used is typically modest, as soy sauce is quite salty, and pouring too much can overpower the delicate taste of the rice. Japanese dining etiquette also encourages using chopsticks to lightly mix the soy sauce into the rice instead of pouring excessive amounts directly onto the rice.