Police officer Tanihara goes undercover and infiltrates the inner circle of a yakuza organization. Gaining the favor of the cold yet principled gangster Kanzaki, he begins to rise in the underworld. However, as time passes, Tanihara is torn between his duty as a cop and the loyalty he feels toward Kanzaki and the organization.

7 years ago, Yoichi died in a traffic accident. His wife Ryoko did not receive compensation from her husband's death. She has since raised her son Junpei by herself. Junpei is now a middle school student. Ryoko also cares for her father-in-law, who lives in a nursing home and she also runs a cafe. Her care is in a difficult situation due to Covid-19, while Junpei experiences bullying at school.

The first installment in the series of fantasy swordplay action movies starring Riki Takeuchi. Muramasa, a mystical blade imbued with the grudges of those persecuted by the Tokugawa Shogunate, reawakens in the modern era. Yagyu Kengo, descendant of the Yagyu Clan and "sealmaster," faces off against the Shimazu Clan, who seek to exploit Muramasa's power for their own gain.

The second installment in the series of fantasy swordplay action movies starring Riki Takeuchi. After the previous battle, Kengo and his allies go to Kengo's father, Muneyoshi, to leave their swords with him and tell him about the masterless Murasame Utsusemi. After Kengo leaves, Muneyoshi is attacked by Shimazu, who suddenly appears.

The third installment in the series of fantasy swordplay action movies starring Riki Takeuchi. Muramasa, a dangerous cursed sword imbued with the grudges of those persecuted by the Tokugawa shogunate, is the subject of repeated deadly battles. Kengo Yagyu, a seal master, faces off against a new figure known as the "Puppet" who is attempting to bring Muramasa back from the dead.

The fourth installment in the series of fantasy swordplay action movies starring Riki Takeuchi. A seal master from another country, Seirai, comes to Kengo Yagyu's father, Muneyoshi. She claims to be pursuing Dokai, who has stolen Muramasa's "Crow," the power of darkness.

The fifth installment in the series of fantasy swordplay action movies starring Riki Takeuchi. Four divine beast swords have gathered under the legendary Muramasa, the Yellow Dragon. The unleashed Yellow Dragon is now resurrected before the eyes of the seal master, Kengo. Fuuga possesses Muramasa's "Utsusemi" within a human and attacks the Sword Masters. Meanwhile, Kengo obtains the Book of Sealing Commandments, which contains all the information about Muramasa, but it is stolen by Kiryu. Through the book of commandments, Fuuga learns of the existence of "Kutsuyomi," a being that possesses the power to regenerate life, and begins to pursue it...

The sixth installment in the series of fantasy swordplay action movies starring Riki Takeuchi.

The seventh installment in the series of fantasy swordplay action movies starring Riki Takeuchi.

The eighth installment in the series of fantasy swordplay action movies starring Riki Takeuchi.