A Regretful Affair

Background
"A Regretful Affair" is an original Megurine Luka song composed by Dysergy. It is the sequel to A Harrowing Affair.

The song is set after the events of A Harrowing Affair. After Klein got his revenge, he safely fled but remained alone with nowhere to go. Soon, he is haunted by and his conscience becomes bothered. One day, he heard the voice of Melody whispering his name in the dark. Overcome with fear, guilt and regret, he flees, but comes across a silhouette who reveals itself to be the ghost of Melody. She then darkly reminds him that she will always haunt him and follow him close behind.