Puree the mango in a blender.
Add cream in a cold bowl. Beat the cream in low speed using a hand blender.
Add mango puree and sugar until the swirls form thick enough.
Keep this in the refrigerator.
Meanwhile, heat a pan with 1/2 cup of water.
Add agar-agar strips and boil until the strips dissolve in water completely.
Add mango puree and cook for 3 more minutes until everything blends together.
Keep this aside for cooling.
Pour 3 tbsp of cream in a glass bowl/cup. Pour the agar-agar mixture above the cream wait for some time until the agar-agar sets.
Pour the cream again on top of the agar-agar.
Keep this refrigerated for at least 4 hours.
Serve chilled.