Combine all of the ingredients for the chocolate cake in a large mixing bowl and knead the mixture by hand until a smooth dough forms. Cover the bowl, transfer it to the refrigerator, and let the dough rest overnight.
The following day, line the bottom of a 9 x 5-inch loaf pan with parchment paper. Take the dough out of the refrigerator, knead it lightly, and transfer it to the loaf pan. Cover the dough with plastic wrap and let it rest again, this time at room temperature for 2 hours. Once the dough has rested, preheat the oven to 350°F. Remove the plastic wrap, brush milk evenly over the surface of the dough, transfer the loaf pan to the oven, and bake at 350°F for 1 hour. Once the chocolate cake is done baking, remove it from the pan and let it cool completely.
Heat the coconut milk and pineapple juice on the stovetop and bring the mixture to a boil. Add the chopped white chocolate and stir everything together until the chocolate has melted, then remove it from the heat and let everything cool down to room temperature. Once the mixture has cooled, carefully fold in the whipped cream and transfer the coconut cream to a piping bag.
Make 6 even incisions lengthwise in the chocolate cake using unflavored dental floss, making sure to stop cutting before you reach the bottom of the cake.
Slice the mangoes and kiwis very thinly and insert them into the incisions made in the chocolate cake.
Pipe the coconut cream into the incisions until the gaps are filled.
Melt the dark chocolate bar and distribute it evenly over the surfaces on the top of the chocolate cake that were left uncovered. Sprinkle coconut flakes over the cake and top it off with fresh raspberries.