Melt the dark chocolate in a heatproof bowl set over a pan of simmering water (bain-marie). Let it cool to room temperature.
Whip the coconut cream until light and fluffy. Combine it with the sugar and the melted chocolate until smooth.
Dissolve the agar-agar in the water. Heat over low heat until completely dissolved. Add it to the chocolate cream and mix well.
Wash the raspberries and set aside a few for decoration. Purée the remaining raspberries and gently fold them into the chocolate cream.
Place the vegan sponge cake layer in a cake pan and pour the chocolate-raspberry cream over it. Spread the top evenly.
Refrigerate the cake for at least 4 hours to set.
Remove the set cake from the pan and decorate with fresh raspberries or grated chocolate. Serve chilled.
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