I think you're the naive one... or maybe you haven't actually read the story? Like the person below you? See Rio is aware of things that you wouldn't typically think an average teenaged boy raised on romantic fantasies would be aware of. He was concerned about being a stalker at one point. And it wasn't a romantic view of a stalker he was referring to. A truly naive person would be someone like Tooru from Fruits Basket. She has all the real life experiences she needs to be aware of the world but she still can't put two and two together for some reason even though she's highly intelligent.
Whiny? I really don't think you actually read this story now. None of the characters were whiny. Having doubts or being insecure is not being whiny. Sorry to tell you the truth. Whiny is someone telling those who do have doubts that their doubts are wrong because they've had worse experiences. A true whiny person would be someone like Haruko from Super Lovers. Or Chika from Dear Myself. Kthxbai.
Is me having my own opinion somehow objectionable to you? Hey, when I read the story (and yes, I did read it) I felt the characters were naive and whiny. You may not have felt that way, and it's okay by me. I won't go calling you names for not agreeing with me, so don't call me names. That's all I'm going to say on this matter.
Story was ok but it wouldn't go on my top anything...the characters were all so insecure and whiny as well as naive in my opinion...maybe I'm just in the wrong mood for this manga..