I have watch this series during last June and it’s so touching and for those want to watch it, prepare for unexpected storyline… yeah even my member that good in predict storyline unable to do it. Just ignore how others member comment about this story and just watch it.
Ok back to this song, I heard it after reach episode 6 and it have beautiful meaning within until turning me into tear. To understand it well, I have searching for English translation and found it in http://www.animeforum.com/showthread.php?t=67949 . Thanks to cranston for this translated lyrics also others contributor forum member, now I can understand what message this song delivered.