Koka Ninja House (Koka-ryu Ninjutsu Yashiki)

Welcome to the Koka-ryu Ninjutsu Yashiki, the only authentic ninja residence still standing in Japan. Located in the rural Konan area of Shiga Prefecture, this house was once the home of the Mochizuki family, the leaders of the…

As you stand before the house, observe its architectural 'mask.' The heavy thatched roof, known as 'Kayabuki,' and the simple wooden post-and-beam construction are typical of wealthy rural residences of the Edo period. This was…

Once inside the main living quarters, we encounter one of the most famous mechanisms of ninja architecture: the 'Donden-gaeshi' or revolving wall. At first glance, it appears to be a standard wooden partition or part of a storage…

Moving into the darker corridors of the house, we find the 'Otoshi-ana,' or pitfall trap. Concealed beneath a section of the wooden floorboards that looks identical to the rest, this trap consists of a deep pit, often three…

Perhaps the most impressive feat of the Koka Ninja House is the existence of a third floor that is completely invisible from the outside. By utilizing the massive space beneath the steep thatched roof, the builders created a…

Beyond the physical traps, the Koka Ninja House serves as a museum for the intellectual and material culture of the Shinobi. On display are original copies of the 'Bansenshukai,' the most famous multi-volume collection of…

As we conclude our internal tour, it is essential to address the historical and philosophical distinctions between the Koka and Iga clans. While both are world-famous for their ninjutsu, the Koka warriors held a specific sense of…

As you step out from the shadows of the Mochizuki residence and back into the sunlight of the Shiga countryside, take a moment to reflect on the legacy of the Koka ninja. The traps and secret doors we have seen are not merely…