Koka-ryu Ninjutsu Mansion

This is the former residence of the Mochizuki family, Koka-ryu ninja, built in the Edo period. From the outside, it looks like an ordinary mansion, but inside it is a ninja house filled with devices and ingenious tricks designed to prevent enemy intrusions. Rather than being relocated or restored for tourism, this valuable building has been carefully repaired and maintained while preserving its original location and condition.

The building has multiple levels, with trapdoors, rope ladders, revolving doors, and trick windows placed throughout. Visitors can freely explore part of the building, and there is also an archive room displaying materials about ninja tools and ninjutsu, offering a look at the lives and skills of ninja from that time.

There are also hands-on programs such as a shuriken throwing experience (additional fee) and a trick mechanism experience. They are popular because visitors can actually try ninja techniques and enjoy them. There is also a souvenir corner on the grounds selling ninja goods and original items.