This Japanese-style confection is 'Fu-ji-to ma-n-jyu-u.'
It is a sweet bean paste covered with a film of rice cake.
It is like 'O-te ma-n-jyu' which is also one of the famous confections in Okayama.
Different from 'O-te ma-n-jyu', they use film that contains 'a-ma-za-ke' and the bun is a special product of Genji and Heike's old battlefield of Fu-ji-to.
I was presented this one by a guest to my house the other day.
It is very delicious with a cup of Japanese green tea.