It's named
辛丹波 （からたんば） .
http://www.ozeki.co.jp/product/seishu/kodawari.html (4th one from the bottom)
市丹波 makes no sense.
The first character 辛 means "sec", which is the opposite of "mild" or "sweet".
This sake can be drunk both ways. I would take a sip of it cold first, then decide whether it's good enough to serve cold.