because of Yasu is a caring type of person, nana felt really safe by his side. even safer than ren's.
that's why, she cared for him very very very much; not to the point of love, because she got ren already.
i also cant accept the fact that hachi and nobu's relationship would come to an end.
because like u say just now, they really made a perfect couple... what to do? fate, maybe...

but among all those men that hachi fell for,
nobu is the best!!
about takumi, hmm... he really seemed like a bad guy nearly to everyone who watch this series.
I despised him too. hate to admit it, but he really is someone that hachi can depend her life for..
u can see it too right? especially when he doesn't want to hurt reira's feeling for him.
he looks kinda bad because he didn't really know how to use kind words to take care of something..... MAYBE!!
i cant say much because i hate him too! LoL

but since u seems like following nana's story, better make it to the end... I can't wait for the sub, so i read it.
me too, just watch the anime till episode 40!