"Unfading Sin") is the debut single by Japanese rock singer Nana Kitade.

[1] The song was used as the first ending theme in the first Fullmetal Alchemist anime series.

The music video for "Kesenai Tsumi" starts out with the image of a doll version of Kitade, that is being slowly pieced together.

Throughout the video are images of pale red flowers, masks floating in a bubbly space and Kitade in a black dress.

"Kesenai Tsumi: Raw "Breath" Track" is an acoustic rearrangement of the song.