"Returner (Yami no Shūen)" (Returner ～闇の終焉～^?, lit. "Returner: Demise of Darkness") is a single released by Gackt, on June 20, 2007, by Nippon Crown. It is Gackt's first single to top the Oricon charts, and the theme song for NHK drama Fūrin Kazan.

In 2006, Gackt continued his tour "Diabolos: Aien no Shi" with a concert on January 14, in Korea, at Fencing Stadium in Korean Olympic Park, which was his first Asian solo concert. In August at an Otakon conference, it was publicly announced that he would form a band S.K.I.N with the co-founder of the Japanese famous metal band X Japan, Yoshiki Hayashi, for which the idea origins in 2002. With the band still in formation, Gackt on December 24 went on a small nationwide fanclub rock tour "D.r.u.g. Party", which was also continued with four concerts in Korea and Taiwan. In January 2007, Gackt starred in the NHK Taiga drama Fūrin Kazan, where portrayed the warlord Uesugi Kenshin Next week, after the single release, on June 29 was held the debut concert of S.K.I.N. at the Anime Expo in Long Beach, California, called the "Japanese rock concert of the century". Although there were high expectations by the public, and Gackt and Yoshiki themselves, all activities were suddenly stopped.

The single was released in a regular and limited edition, which beside the title song also included two live recordings of previously published songs from D.r.u.g Party Tour, only the limited edition to come with the music video for the title song. The inspiration for the image used in this single ties into the NHK drama Fūrin Kazan, in which Gackt plays the warlord Uesugi Kenshin. Gackt performed the song live on the 58th Kōhaku Uta Gassen.

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