This is the 9251st most frequent Japanese word.
甲賀
"甲賀" refers to Kōga, a historical region in Japan famous for its ninja traditions.
In this sentence, '甲賀' refers to a geographical location known for its historical association with ninjas.
甲賀は忍者で有名な地域です。
Kōga is a region famous for ninjas.
Here, '甲賀' is used to describe the specific style or heritage of ninja techniques originating from the Kōga region.
漫画の中で甲賀忍法が使われています。
In the manga, Kōga ninja techniques are used.
In this context, '甲賀' denotes a school or tradition associated with the ninja practices and culture of the Kōga region.