Grandpa's Adventure!

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

Summary
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....