It's a pity Kurata fooled Hachi with that photo of Shin and Ryoko and made her choose not to interfere with the article 'bout Nana's mother. What's worse is that he told her that Takumi sacrificed Hachi for Reira&Ren's sake. Though he did not lie, he showed it up to feel her awful. It was a mistake of Takumi to not tell Hachi all about that stuff, I'm sure she would understand... and now that it comes to Hachi this way, she's surely not happy.
However, Kurata does not seem to be such a bad guy as from his actions at a later time when he said to his boss he hadn't found Nana Osaka and sent photos of her and the location to Hachi.
Also, I'm really glad that all those clues about NANA passing away were not about her death but about her running away, it's cool she's alive so there's still hope for continuation of the story "in our time".