The Ritual Tome, named Gishiki no Sho: Hitobashira (Ritual Book: Human Sacrifice) in Japanese, is an old book found in Fatal Frame II: Crimson Butterfly. The book is one in a set of five tomes about village customs. The Ritual Tome describes the Hidden Ceremony, a second ritual performed separately from the Crimson Sacrifice Ritual to calm the Hellish Abyss. The Ritual tome is also used to solve the Tome Puzzle in the Master's Room to obtain the Light Key. The key word in the tome is "Kusabi (楔)" and is highlighted red.