Preheat the oven to 350°F (175°C).
Prepare the crust by mixing the crushed chocolate graham crackers and melted butter together.
Press the mixture firmly into the bottom of a 9-inch springform pan.
Bake the crust for about 10 minutes and then let it cool.
In a large bowl, beat the softened cream cheese until smooth and creamy.
Add the sugar and cocoa powder to the cream cheese, mixing until fully incorporated.
Blend in melted dark chocolate and vanilla extract until smooth.
Add the eggs one at a time, mixing gently after each addition.
Gently fold in the fresh raspberries to the cheesecake mixture.
Pour the cheesecake mixture over the cooled crust and smooth the top.
Bake the cheesecake for 50-60 minutes or until the center is set but still slightly jiggly.
Turn off the oven and let the cheesecake cool inside with the door ajar for an hour.
Refrigerate the cheesecake for at least 4 hours, preferably overnight, before serving.
Garnish with additional raspberries before serving.