|"While we're stuck waiting, why don't you tell us who's really under there?"
The maps of the Oni Mask of Hatred are maps that showed the way to the last Oni Mask.
When Cole tries to repack the baby, he finds that the baby has been wrapped on a map the whole time. When he then shows the map to the ninja, they decide to go to the place where the last Oni mask is hidden, to the Oni Temple in Primeval's Eye. When Samurai X attacks the ship and Harumi and Lloyd stay in the mech, Lloyd encloses Harumi in the mech and uses the map as a parachute himself, although Harumi proposes the idea a while before, but Lloyd rejects it.
When Lloyd and Harumi fall into Primeval's Eye, Lloyd bumps his arm and wraps it on a map. According to the map, they then go to the temple. When they find an abandoned boat on the river, they find the same map inside.
- It is unknown whether the map is really made of paper, as Baby Wu was wrapped in it and no one noticed that it was not a blanket, the map also served as a parachute and Lloyd had his arm wrapped in the map.
- This is the fifth plot-important map in the series, the first four being the Map of the Golden Weapons, the Map of Dens, the Map of Fangs, and the lantern (the map to Tiger Widow Island).
- It is unknown who created the map, as the only person known to have attempted to map out Primeval's Eye was Dr. Yost, who got lost there.