Well, this is a beautiful and moving story. Look at Sugh's summary, that sums it up. This story is a bit to deep for a lot of the readers. Like I see the negative comment from Ren-Chan is a twelve year old boy. If you kids want to try and grow your mind so you can't better understand the layers and depths of story telling I recommend trying out Brave Story by Miyuki Miyabe. Every kid going thru hormones has a difficult time. It's important not to dumb it down and become some generic angst you kid. Be self aware, and read the stories that can help you grow as an individual and not just languish as a caricature.
Crystal Palace