ISOtone

 is the fourth single by Kon Natsumi.

CD

 * 1) ISOtone
 * 2) Sleep without a memory
 * 3) Despair Syndrome
 * 4) ISOtone (Instrumental)
 * 5) Sleep without a memory (Instrumental)
 * 6) Despair Syndrome (Instrumental)

Limited Anime Edition DVD

 * 1) Non-credit Opening
 * 2) ISOtone
 * 3) Sleep without a memory
 * 4) Despair Syndrome

Limited Artist Edition DVD

 * 1) ISOtone (Music Video)
 * 2) ISOtone
 * 3) Sleep without a memory
 * 4) Despair Syndrome