According to a Twitter post from @CappyinBoston, Samurai Kuang Eatery on Franklin Street in Downtown Crossing is closed and will be replaced by Avana Sushi. An article from Eater Boston mentions this as well, though it does not know if this will be a third location of Avana or a move from its location on Beach Street in Chinatown. (Another location can be found in Reading.)
It appears that Samurai Kuang Eatery is at least indirectly connected with Samurai on Boylston Street in Boston's Back Bay; that restaurant remains in operation.
The address for the now-closed Samurai Kuang Eatery (and new Avana Sushi) is 58 Franklin Street, Boston, MA, 02110. The website for Avana can be found at http://avanasushi.com/home-page/
[January 14, 2016 update: A new article from Eater Boston states that the new location of Avana is now open; EB also says that the original remains open as well, and that the new location is larger than the Beach Street restaurant.]
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[Related article from our sister site (Boston's Hidden Restaurants): Slideshow--Twelve Food Items from Asian Restaurants in the Boston Area]
