Trying to find a fun Japanese restaurant near Soho in London for a friend' s birthday party?

Having a friend's birthday, and we want a Japanese or Asian Fusion restaurant in or near Soho in London to go to. We are heading for karaoke after dinner, so need a restaurant with good atmosphere, saki, basically a place to eat and drink enough to want to sing post dinner! Wagamama does not count as good atmosphere!

Group of about 12 people, and ideally need a restaurant that has more than just sushi as well for picky eaters (so hot and cold Japanese or Asian Fusion food)

Thanks!

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