Looking for chocolate mousse

I have been to Japan before and enjoyed many kinds of delicious desserts at various restaurants.

I have not found a restaurant that serves my favourite dessert in the world, chocolate mousse.

Can you please tell me, where could I find the tastiest chocolate mousse in Tokyo?

Chocolate mousse is the sort of thing you're more likely to find in a high end patisserie than in a restaurant, although you might be lucky at one of Tokyo's many excellent French restaurants.

Try this place for delicious sweet morsels:

http://travelling-foodies.com/2013/07/19/patisserie-hidemi-sugino-kyob...

Thanks for the link!

It doesn't have to be in a restaurant, any place where I can get chocolate mousse is fine. At the moment I can't even get it at home, so any place will do.

Supermarkets and convenience stores often sell it.