This article is related to a game, manga series or other media that has not been released outside Japan. The coverage here may differ from what it would be in an official translation.
The Zabuton (Japanese: ざぶとん) is an item in Densetsu no Starfy 2. It is found in Stage 2-1 (Gluglug Lagoon) in a room full of Pinpin with the Cheap Chair and the Shell Chair. When Starfy approaches one of these items, the game will ask whether the player wants to collect it.
In the story, Ruby asks Starfy to find her some furniture, including the Vase of Roses, the Coral Table and the Shell Chair. The Zabuton is one of the wrong answers. If Starfy brings Ruby the Zabuton, she won't accept it and the Zabuton will no longer appear in the room.