Kuukiyomi is the name of the game, although it seems more like an interactive etiquette course than a proper game.
That's not to say it's a bad idea; watch the trailer. It's positively fascinating. And if they can actually make the lessons in good manners fun (it's tough to tell from the trailer, but certainly it can be done...see Sesame Street for example...), then we'd be interested in seeing an English-language translation.
It will be available in Japan this spring for 500 Nintendo Points, which is one of the pricier games we've heard about so far.
Watch the trailer and comment below, but keep it extra polite; Kuukiyomi is watching!