Grandpa's Adventure! is the 4th episode of Pastel Yumi, the Magic Idol. It first aired on March 28th, 1986.


While Yumi is helping out at the bazaar, Dankichi and Kenta come by with a treasure map and invite her to join them on their adventure. After figuring out the map leads to a cave in Mount Flower, the three travel across an underground lake in a pirate ship produced by magic. Then they climb a stone staircase, only to end up in a room under Mrs. Fukurokoji's mansion, where they find....