In order for this cheat to work you need to have the invisibility ninja item for Rikimaru and the the disguise ninja item for Tesshu(i suggest using the all items cheat). At the item screen select these items. When you get to the point before the cutscene use the the item and when the cutscene begins your character will either invisible(Rikimaru)or dressed as an enemey(Tesshu)note:this affect doesnt last very long.