Pain Killer is the fourth studio album by Japanese pop duo moumoon.

[1][2] The album was released in four editions: Four songs of the album were released as singles: The first single, "Love is Everywhere", was released on March 14, 2012[6] and peaked number 33 in Oricon's weekly singles chart.

[11] The song "Doko e mo Ikanai yo" was used as ending theme song for the TV drama Yuusha Yoshihiko to Akuryo no Kagi and the song "Midori no Michi", used as b-side of the single, was used as theme song for the short movie Heather Love ♡ Short Movies.

Beside the singles, two songs included on the album were used in movies and TV shows.

All lyrics are written by Yuka; all music is composed by Kousuke MasakiThe album debuted at number 8 on its first day of chart on Oricon[14] and it climbed to number 4 on its second day.