Swaying to the soothing strains of "Mary Had a Little Lamb," a little girl sets the table for her special tea party, with a giant stuffed toy broccoli and Mickey Mouse as her invited guests. I had been in this space years ago, child-free, only then there was Champagne instead of orange juice, and ambient harp music in the background.

After going through multiple possibilities for this interesting space, which is perched on the 59th floor of the Sunshine 60 skyscraper in Tokyo's Ikebukuro neighborhood, the restaurant group Casita settled on a winning formula: peaceful dining for parents, toys and slides for the kids.

The Dome is completely separate from the main dining area of Ocean Casita, Casita's Italian-style seafood grill, but patrons can still enjoy the same items on both menus.