I think this manga is a clear example of how a bad storyboard can ruin a story.

The manga includes two stories:
Kimi ni Shika Kikoenai (Calling you), a one-shot about two highschool students who communicate psychically through cellphones they created in their minds.
Kizu (Kids), a story organized in two chapters, about a boy who can absorve the wounds of other people.

I have nothing against one-shots, or short mangas. I´ve read really good ones, and there are even some one-shots among my favorite mangas. I also think works should be judged within their genre and kind. Comparing a short and a long manga would be the same as comparing a short story with a novel. There is no use in doing that. But in this particular case, I think there was too much information to convey in such little space. At moments, the story isn´t clear, it´s too rushed, there are many gaps in the storyline, it´s chaotic. I think the art didn´t help either. I found it two "girly" and overly ornamented. The general feeling I got is that it ended up dealing with a deep and moving matter in a very superficial way.

To be true, the feeling I got may be related to the fact that I already knew the stories when I read the manga. When analyzing it, I cannot help but compare it with another version of these two stories, both drawn by Kiyohara Hiro, which are much, much better. They are two separate mangas, with the same titles: Kimi ni Shika Kikoenai, and Kizu. The first one has 5 chapters, the second one 4. They have a much slower pace, the character development is way deeper, the art is simpler, and has a more mature feel to it, which suits this plot better.

This version is just average. The story is still good. Otsu-Ichi´s story is still the same, so I can´t rate it as "bad". The problem is the adaptation.
I highly recommend reading Kiyohara Hiro´s version.