Ako Castle & Oishi Shrine

Ako, a 30-40 minute train ride west on the JR Ako Line, is forever bound to the legend of the 47 Ronin—masterless samurai who avenged their lord’s death through an act of ritual suicide. This tale, known as Chushingura, remains the most revered narrative of loyalty, honor, and sacrifice in Japanese culture.

The castle ruins themselves are unassuming—weathered stones on a modest hill. What matters is what they represent: the home of these legendary warriors. Adjacent Oishi Shrine is dedicated to their memory, drawing pilgrims year-round. The town’s salt-making heritage, preserved in the Marine Science Museum, rounds out the historical context of a city that once thrived as Japan’s salt capital.

Ako pairs naturally with Ako Onsen, a hot spring resort featuring infinity pools that face the Seto Inland Sea—the perfect place to contemplate samurai sacrifice as the sun sets over the water.

Ako Castle was completed in 1648 under the Asano clan, who ruled the Ako domain. The Tokugawa shogunate refused permission to build a main keep, so only the stone foundations and corner turrets were ever completed — which is why the ruins have a spacious, unenclosed quality compared to fully built castles. The stone walls and some turrets survive in reasonable condition. Oishi Shrine within the castle grounds was established in 1912 to enshrine Oishi Kuranosuke (the leader of the 47 ronin) and all 46 of his companions. On the approach path, stone statues of each of the 47 ronin line both sides of the walkway in the attire they wore during the December 1702 raid on Lord Kira’s mansion in Edo.

The event itself: in 1701, Lord Asano of Ako was provoked into drawing his sword on a senior shogunate official (Lord Kira) in Edo Castle — an act punishable by death and confiscation of domain. Asano was ordered to commit seppuku. His 47 retainers, now masterless ronin, spent nearly two years planning their revenge, then attacked Kira’s Edo mansion on December 14, 1702, killed him, and carried his head to Asano’s grave at Sengakuji Temple in Tokyo. The government subsequently ordered all 47 to commit seppuku. The tale became the defining moral narrative of the samurai class, endlessly retold in puppet theater, kabuki, and later film. The December 14 anniversary is marked each year at Oishi Shrine and at Sengakuji in Tokyo. The Chushingura Festival runs mid-December in Ako with processions in period costume. Access: JR Ako Line, Banshu-Ako Station, then 15 minutes on foot.