Heikousen

 is the fourth (fifth overall) single by Sayuri.

Regular Edition CD

 * 1) Heikousen (平行線)
 * 2) BANDAGE -Hikigatari ver.-

Limited Edition CD

 * 1) Heikousen (平行線)
 * 2) Anonymous (アノニマス) -Hikigatari ver.-
 * 3) Neverland (ネバーランド)

Limited Pressing Edition CD

 * 1) Heikousen (平行線)
 * 2) Suicide Sakana (スーサイドさかな)
 * 3) Heikousen (平行線) -Anime ED ver.-

Limited Edition DVD

 * 1) Heikousen (MV) (Full Length ver.)

Limited Pressing Edition DVD

 * 1) Heikousen -Anime "Kuzu no Honkai" Non-credit ED Video-