Following Dog Day Afternoon, SKELETON LIFE is Lamune-P's 6th Vocaloid work. It became quite notable, exceeding Dog Day Afternoon's views, making it his notable work to date. It's his second work to reach Nico Hall of fame (exceeding 100,000 views) with currently over 200,000 views to date.
The interpretation to the song are various; many have interpreted Rin on wanting study / discover more in life, thus her to disguise herself as a boy ("Len"), living in a world where girls "shouldn't" study along with boys.
Others have interpreted the song as Rin wanting to live life to the fullest, and not as a skeleton who's lifeless. Nonetheless none of them are fixed.