Designed by Eight Branding Design, Japan.
In recent years, something called zakkokumai (雑穀米）has become increasingly popular in Japan. Zakkoku just means “mixed grains”, and mai is rice. Another name for essentially the same thing is kokumotsu gohan （穀物ご飯）. It’s rice that has a small amount of various grains and seeds mixed into it prior to cooking. You can then cook the rice in a rice cooker in the normal way. The grains and seeds add a mix of nutrients and fiber, and a little flavor too.
Zakkoku or kokumotsu mixes are sold in convenient packets. Simply throw in the contents after you’ve washed the rice and put in the water for cooking.