ねずみたちです。

Because his onigiri had gone into the hole, the old man became worried. To look for the onigiri, the old man also tried going into the hole. It was dark inside the hole, but after walking for a while, he came out into a bright place. Many mice lived there. The mice had found the onigiri and were very happy. They were happily eating together, singing "Omusubi, kororin, sutton-ton."