Specifically, the Fondant Chocolat Marshmallow donut is a chocolate heart-shaped donut filled with dark Belgian chocolate cream, topped with chocolate icing, crumbled graham crackers, marshmallows, and a chocolate drizzle. They go for 250 yen (~$2.06 US) a pop.
There's also a strawberry version, the Fondant Chocolat Strawberry, which is the same donut but with topped with dried strawberries and strawberry chocolate curls.
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