Heart Key

Only in Japan!
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The Heart Key is an item in Densetsu no Starfy. It's found in the Sunken Ship. It's one of four keys based on the four French playing card suits. The other keys are the Spade Key, the Club Key and the Diamond Key.

In the story, Dolchina and Dolshi are trapped inside a large prison cell by Boctopus. Sometime later Boctopus patrols the room. He is angry at the fact that their sister Dolfy is coming to help. Boctopus leaves to hide away the keys, but carelessly drops the Heart Key right outside of the prison cell. When Dolfy arrived inside of the Sunken Ship, she picked up the Heart Key and tried to open the cell to no success. Dolfy learns that only all four keys may open the cell.

Dolfy gives the Heart Key to Starfy and Moe and hopes that they will find the other three keys to rescue her siblings.