The fic is set in an Alternate Universe of Digimon Adventure and Digimon Adventure 02. Set in the year 2004, Taichi and the others have never been to the Digital World until a trip to Tokyo Tower, when they are forcibly pulled into the Digital World, to find themselves embroiled in an all-out war.
Neo Digimon Digital War contains examples of the following tropes:
- Bad Dreams: Hikari has been plagued with recurring nightmares that she can never remember since five years prior to the start of the series.
- Bring My Brown Pants: In chapter 6, Hikari's nightmares get so intense that she both wets and craps her pants.
- Darker and Edgier: Than the source anime, featuring such things as Hikari's recurring Bad Dreams and a prominent War Is Hell theme.
- Troubled Fetal Position: At the end of chapter 6, Hikari assumes one after a Bad Dream.