The different point from Koka school which was located in the other area parted by a mountain was for Koka Ninja to dedicate their loyalty to a single lord, while Iga Ninja had no relationship with their employer other than the financial contract made with him.
山を1つ隔てた場所に存在する甲賀流と異なる点は甲賀忍者が1人の主君に忠義を尽くすのに対し、伊賀忍者は金銭による契約以上の関わりを雇い主との間に持たない点であるとされる。