A memory of the lullaby

Background
Pi~ Nu~ Pi Nu~ to~ Pi~ Nu~ ! (ぴ～ぬ～ぴ～ぬ～ぴ～ぬ～！)

A memory of the lullaby is a folk song composed by Asin Kuroda and first work with Aoki Lapis. The song was written with a fictional language just like the songs of the same genre.