In episode 17, the Mermaid Queen gave Laura the Mermaid Aqua Pact in the form of an old petrified pact.

The pen can also be inserted into a hole at the bottom of the pact. The pact also comes with a purple pen with a blue-crystal tip for Laura to use during the transformation and attack. A large crystal dial resides in the middle of the pact, which is spun during use. When opened, the pact flicks open to reveal a pale purple base with cyan designs and silver hearts on the right side. A large light purple keyhole decorated by a pink bow is at the top for Heart Kuru Rings to be inserted in, with a blue crystal holding the pact together. This is the third item in Pretty Cure to have the word Pact in it after Rose Pact and Smile Pact.The Mermaid Aqua Pact resembles a peach-coloured seashell with pale pink and marine-blue edging resembling waves, as well as pink and yellow stars on the top. To use the pact, the user gains a small, pale pink mixing spoon-like pen. It has two pale pink stars for buttons and six smaller stars coming in pink, red, yellow, mint, sky blue, and purple. The inside of the pact is adorned with a frosting and star motif. To open the pact is a garnet in the shape of a star. Swirls of color adorn the lid, separated inches apart and coming in mint, sky blue, purple, violet, pink, orange, and pale yellow. In the center is a gold medallion with a cake drawn on it, surrounded by stars and frosting border. The lid is white with a dome shape with a frosting border.

The two pieces attach by a piece on the back adorned with three stars. The pact resembles a cake, with the pale pink bottom accent by diamond studs and frosting shapes to match those on the top. To activate the transformation, the girls need to shout out the phrase, 'Cure La Mode・Decoration!'. Sweets Pact (スイーツパクト Suītsu Pakuto?) are the official transformation items used by the Cures in KiraKira☆Pretty Cure A La Mode.

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