Ancient Japanese Ronin warriors set 300 years after 47 Ronin, in a modern-day world where Samurai clans exist in complete secrecy.

Ronin is the Japanese word used for Samurai without a master. In this case, the Ronin are outcast specialists of every kind, whose services are available to everyone - for money. Dierdre (undoubtedly from Ireland) hires several Ronin to form a team in order to retrieve an important suitcase from a man who is about to sell it to the Russians. After the mission has been completed successfully, the suitcase immediately gets switched by a member of the team who seems to work into his own pocket. The complex net of everyone tricking everyone begins to surface slowly, and deadly...

While hunting in the forest, Lord Asano of Ako and his samurai find a young half-breed and take him with them to live in the castle. Several years later, Lord Asano holds a tournament to welcome the Shogun to Ako. The night after the tournament, Lord Asano is bewitched into hurting Lord Kira of Nagato, and is punished into committing seppuku by the Shogun. Realizing that it was a Lord Kira's evil plot, the samurais and the half-breed sets out for revenge against the Shogun's order.

Kenshin Himura (Takeru Satoh) is a legendary swordsman. After the Meiji Restoration, he has stopped killing with the sword. He tries to live a peaceful life with Kaoru Kamiya who runs a swordsmanship school in the village. Things change. Akabeko Restaurant, which is Kenshin Himura's favorite place to eat, is destroyed. Kenshin Himura finds a note written "Junchu" there.