六兆年と一夜物語 (Roku-chou Nen to Ichiya Monogatari)

Background
This song was first uploaded on April 11, 2012, and has entered the Hall of Legend and reached over 10 million Youtube views. It's widely considered IA's most notable song.

The song tells of "a fairytale that no one knows" about a demon boy with no name, abused by his mother, and who only wanted to be human. He wants to die, and he can't see any dreams in his future. One day, a girl came to the prison where he was held. Although talking was forbidden, she asked him what his name was, and said that they would leave together. They do, and despite the fact that they know nothing about each other, they are happy, and it is just the two of them.

This song is featured in the album PANDORA VOXX, the EXIT TUNES compilation album Vocaloconnection, TEAM Entertainment's IA THE WORLD ～風～ (Kaze), avex trax's Yoen Waso Emaki, and the compilation album VOCALOID 超BEST -impacts-.

Concerts
This song was featured in the IA First Live Concert in JAPAN -PARTY A GO-GO- concert.

Novel
In 2013, a novel was released based off of the song as a part of his "PANDORA VOXX" series. It revolves around the boy in the song who is named "Riku" by the girl who is named "Ai".