Parallel world

 is the major debut (fourth overall) single by Wonder Weed.

Regular Edition A CD

 * 1) Parallel world
 * 2) Todokanaiya (トドカナイヤ)
 * 3) Answer

Regular Edition B CD

 * 1) Parallel world
 * 2) Todokanaiya
 * 3) Yahhoo (ヤッホー)

Limited Edition CD

 * 1) Parallel world
 * 2) Todokanaiya

Limited Edition DVD

 * 1) Parallel world (Music Video)
 * 2) Parallel world (Making Documentary)