Sengaku-ji is a small Soto Zen temple in Minato that sits quietly at the center of Japan's most celebrated historical drama. The temple holds the graves of the 47 Ronin — the masterless samurai who carried out one of history's most famous acts of revenge in 1702 — and the grave of their dead master, Lord Asano.
The grave complex is open to visitors, and the atmosphere is genuinely moving: rows of simple stone markers, each with the samurai's name, and almost always a few sticks of fresh incense left by people who still feel the pull of the story three centuries later. A small museum at the temple holds armour, weapons, and documents related to the incident. Sengaku-ji is accessible via the Toei Asakusa Line to Sengakuji Station.