Yuri's reaction is understandable. Most girls would feel jealous after seeing their boyfriend with his ex. And to further it, Hachi and Nobu aren't really doing the best job of hiding their emotions. So Yuri's feelings are natural. But I still can't help but hate her for pushing Nana overboard. >_> Do what you want to Hachi, it's typical, but don't hurt Nana.
Poor Shin, knowing that Reira loves Takumi. Oh well, he's still young. He'll find someone else, probably.