The story begins interesting, but it falls flat with the characters. The main character is a Mary Sue. Despite all the bad luck, he solves everything easily, is loved by everyone, even people he has just met, he's a perfect man, kind and humble, always apologizing and thanking. Even people who hate humans, love him, and if they don't love him, they are bad people.
The villains are also unidimensional. They are bad because they are bad and have villain's faces.
Side characters are also unidimensional. They love Rio and are saved by him, and that's all there's to them.
Another problem is that there's no main cast, Rio travels around and doesn't keep a party with him, changing the characters he interacts with all the time.
I read 28 chapters and despite the beginning having setting up a nice story, the characters ruin it.