Ugh, I wanted to like this so much... and I just couldn't get there. The first key question, unfortunately: is it racist? Answer... not really? It's about the same level of "accurate portrayal of Japanese business magnate" as a Harlequin category novel's "accurate portrayal of Greek tycoon," I'd say, but I feel like I'm a little immunized to the Greek/Italian thing after years of Harlequin Presents novels, so when it's Japan that's being category-ized it feels more uncomfortable. The hero speaks English somewhat awkwardly at times and there's a lot of bowing and Japanese business traditions (and sexism) involved.
That said, there was so much going on in this novel - the heroine is a trophy wife-turned-business tycoon dealing with hostile stepchildren, the rediscovery of the daughter she gave up for adoption as a teenager, and this whole weird business merger thing... and because the hostile stepsons (and daughter) are all protagonists of previous novels, we're not supposed to hate them. Tough toodles, because I did hate them. The stepsons are all jackasses and while the self-martyring heroine sacrifices herself and her happiness to try and save the company that belonged to the much older husband (who never loved her and left her a note saying the same) because of the importance of family, they're calling her a trophy wife and treating her like crap well into the last quarter of the novel as well as saying things like "well, now that Dad's dead I guess you need to move on to the next rich guy as quick as possible, huh?" (regarding her romance with the hero). There's a half-assed apology at the end of the book and that's supposed to suffice. It does not.
Additionally, the hero's dealing with this whole weird business merger thing, his mildly troubled teenage daughter, his guilt over the death of his late wife, and his racist, hostile father's opposition to the business merger and/or the hero moving on with his life. So like I said, there's a lot going on and it all happened too quickly for me to care about any of it. But really, I'd say the book's fatal flaw is the sheer amount of obnoxious, previous-book-hero stepchildren, because the heroine was a total doormat and the narrative didn't want to make anyone the villain. There was a gem of something actually sweet in the actual romance, but too much time was spent on everything else to really enjoy it.