The museum presents the maritime history of the Murakami Suigun, known as “the lords of the sea”, who were in control of the Seto Inland Sea during the Sengoku period. The exhibition includes precious documents on the history and culture of the Murakami Suigun and the Imabari area. Visitors can experience the life of a pirate by putting on a suit of armour or paddling against the sea currents while enjoying views of the rapids around the Noshima castle ruins and the Hakata and Oshima Bridges.