Ozu Castle is one of few Japanese castles with a keep reconstructed with wood instead of reinforced concrete. Specialist architects and carpenters helped to recreate the structure with traditional joinery techniques and building materials, such as bamboo, plaster, tile, and mud. The timber was gathered from the surrounding countryside and the few iron nails needed were hand-forged by a master craftsman.

A grass-roots campaign by the citizens of Ozu led to the reconstruction of the keep and sparked interest in preserving more historical buildings in Ozu. Guests can reserve overnight stays and experience the luxury of having an entire castle to themselves, with a rousing welcome by samurai troops, fine meals, and other customizable programs.