If you have regular suicidal thoughts, you may not want to watch this, as it revolves around the general concept. Nevertheless, it's one of my favorite UtsuP songs in addition to one of my favorite Hatsune Miku songs.
This is a remake of UtsuP's first song. He has evolved so much. This is one of my favorite songs by him as well as one of my favorite songs with Hatsune Miku in them.