秘ひ伝でん書しょ

noun

book of secrets; secret manual

Refers to a written record of secret knowledge, techniques, or traditions, often in martial arts, crafts, or esoteric arts.

• その武ぶ術じゅつの流りゅう派はには、代だい々だい伝つたわる秘ひ伝でん書しょがある。

  That martial arts school has a book of secrets passed down for generations.