Locations Of Invisible Chests:

Next to the Dragon Shrine where you got the Lighting Sword: *Healing Roots*
On the roof of the tower on Nobunaga's castle right near the broken gate: *10 Rounds of Bullets*
In the big blue door room in Nobunaga's castle right where the wooden floor meets the stone floor: *Mixed Roots*
In the tunnel behind the room where you fought Gogandantisu for the first time:*Super Demon Medicine*
The room with the lost spirit in Nobunaga's castle: *Big Demon Medicine*
In the room with the lucky charm and the Earth Seal in Nobunaga's Castle: *10 Rounds of Bullets*
The tunnel past the room with the Red Axe Ox in the caves of the stoned people:*10 Rounds of Bullets*
At the top of the inclining trail near the boat house: *Pill Medicine*
At the end of the bone decorated hall:*Healing Roots*
In the small maze in the underground lower level of Demon Island: *10 Rounds of Bullets*
From the small maze head up the elevator and search inside that room: *Pill Medicine*
At the entrance to the iron works, to the right side of the screen: *Healing Roots*
Aboard the airship in the ammunitions room next to the door: Pill Medicine