I may not have finished this series yet but I intend on editing and revising this once I do =]
When first reading KnKBnK I was worried that the storyline would chronicle the adventures of Kazusa and Asuka saving the world one agnsty teen at a time. However that is not the case. Kazusa and Asuka don't want to save the world, they search for hurt souls but instead they just let their hearts out for the world to see so everyone can feel their friendship and love.
Now I'm not artist but I didn't personally find any problems reading the story artwork wise so all I will comment on is the dogs. Now in most shoujo mangas I've found that the animals seem to suffer the most on their design. But in KnKBnK the dogs are drawn beautifully to represent their breeding and their emotions just as the humans are! Which of course being that this is a story about Dog Therapists the dogs are a centerpoint in character development and the plots progression, I believe that the dogs design is vital.
As for the characters, if you just glaze the surface you'll see Kazusa as the typical shoujo boy, he's pretty good looking, fairly good body, sweet, and always knows the perfect thing to say. Wrong, if you pay attention you'll see that Kazusa doesn't always know what to say and sometimes he really doesn't know what to do. But what makes him seem like the perfect boy is because he is devoted to his friends and believes in them. As for Rino, she has made mistakes in the past but with the help of Kazusa and some loving K-9s she begins her journey to discovering what she can do and who she wants to be. Now for the dogs, of course their isn't much to say but the unconditional love of dogs is captured in KnKBnK and their need for love and friendship is also shown in a darker manner to show how dogs may have unconditional love but still have needs.
I know my scores may seem very high to some readers but slice of life is my favorite genre and KnKBnK captures the genre while still manging to shove in some drama and hints of romance. I follow Kazusa, Rino, Asuka, and Kuon's stories with my eyes glued to the pages and my heart full of hope for the 4 to rise above any problems they are presented with. The depiction of friendship, unconditional love, believing in your friends, and finding the strength to go on will make you smile, cry, and feel good about the world. I give Kimi no Kokoro Boku no Kokoro an 8 because the story is simple but meaningful, slice-of-life yet dramatic and enough smiles and tears to wear your heart out.
If you want to read a story about friendship, moving on, dogs, and people believing in each other along with themselves them Kimi no Kokoro Boku no Kokoro is for you.