I think Nao might be interesting if you look at the opposites. He's the polar imagine of Takano. He knows Ritsu in every way Takano still doesn't. I'm sort of hoping him liking Ritsu makes both of them realise, that they need to open up more. Both are now being chased by someone, so I hope it won't feel repetive because there's an angle here to increase the communication skills of the couple.
That would be nice, but I wish it didn’t have to be done by making Nao romantically interested in Ritsu. It’s unnecessary, and it could have been handled by Nao teasing Takano about him knowing more as he seems to be doing in Chapter 26, so what’s the point of making another rival out of him?
Either way, I’m sure they’re going to end up coming around to each other more, it’s just an issue of how it will be handled. It’d be bullshit if it was just a sudden “oh I’m just gonna be totally open with you about absolutely everything” considering what we’re at now with them. It’s gonna have to be gradual, and they’re going to get to know each other more and more at their own paces (and some people’s paces are a bit…faster than others). Even now, it seems like Ritsu is going to him more and more, so get ready more development in coming chapters. :3c