S1·E57 Ghost Mountain!

Laura and Kana go to visit Mr. Yoshi's family in the mountains. As it turns out, Mr. Yoshi's mom is a great storyteller! The girls listen to her recount the tale of two ghosts, Harry and Ernie, who used to hunt hamsters on the mountain. But in the end, one day, Harry and Ernie didn't come home, and so now their ghosts are said to still wander the mountain.