This is an ohagi (sweet rice balls covered with anko) made with leftover rice. Since the anko is not too sweet, even people who don't like sweets will enjoy it too.
When I wanted to make an ohagi, I didn't have sticky rice, so I tried making it with rice. I just came up with recipe on a whim.
It tastes better when the rice is a little bit soft. You don't need to mash the rice.
Enjoy Japanese food around the world.