What you need is a strong voice with good writing skills. Someone who can be open and honest about your products without being sort of, you know, "BUY THIS PRODUCT SO I CAN EAT!" Technically, that would kind of be what the blog is about, seeing as you want people to buy your product and I want to eat. But, the object here is to get people to see that you have good products.
SO, you need someone who is very interested in Japan without being all "KAWAII KAWAII DESU!!!" Otaku-fangirl about it. Frankly, that's just straight up embarrassing and I'm sure that you do NOT want that kind of blogger promoting your items. You want an honest person who can speak the truth about your items without embellishing it seeing as the public HATES being lied to. And you need someone who can relate to your target demographic (adults ages 20 - 35(I assume)) and whom your demographic can relate to.
Oh, hey, check it out, I am all those things! Plus, I enjoy cooking. And if you're going to have a blog about Japanese cuisine, then your blogger should probably like cooking and sharing what they're doing.
There's not enough room in this box for my writing style. There never seems to be enough room in these boxes and peoples attention spans never seem to be long enough to read them. Ever considered a video blog for your purposes? Probably a good idea. I'd watch it.
Let me know if you decide to go with me! I'm the perfect choice! Shoot me an email! Don't be shy; I don't bite.