You've seen the Niigata version and here is the Akihabara version - "Oppai Purin" (Breast Pudding) being offered to you by a cutesome blushing maid.
Comes with some caramel sauce for those of you who like to eat yer wobblies while they are slippery.
Also comes with a spoon for those of you who like to tease your food before om nom noming.
Sounds like something you would pick up from Akihabara on yer next visit?
Japan Breast Pudding
Photo taken at the Kotobukiya Store which is just outside Akihabara station. Forgot how much it costs but I think its about 500 yen.