Pour the strawberry liqueur into the bottom of a martini glass. Shake the bottle of white-chocolate liqueur; measure 1/2 ounce and pour it over the back of a spoon on top of the strawberry liqueur to make a separate layer.
Shake the creme de cacao, heavy cream and chocolate syrup in a cocktail shaker with ice until frothy. Slowly strain into the glass over the back of a spoon to make another layer.
Photograph by Kana Okada