The Kusarigama (Chain-Sickle)—Structure, Usage, Schools of Practice, Miyamoto Musashi's Legendary Confrontation, and the True Nature of Ninja Culture

What is the Kusarigama? — A Compound Weapon Born from Farm Tools

The kusarigama is a compound weapon consisting of a sickle (kama) fitted with a chain (kusari), which has an iron counterweight (fundō) attached to its end. While it evolved from a sickle used for agricultural work and belongs to a completely different lineage from swords, the kusarigama is frequently discussed in the context of "confrontations with swords" in Japanese martial arts history.

The origins of the kusarigama are unclear, but it is believed to have been systematized as a martial discipline from the late Muromachi period through the Sengoku period. A compelling theory suggests that the prototype was created when farmers, country samurai, and others who were not permitted to openly carry formal swords repurposed and modified farm tools and everyday implements as weapons. Today, kusarigama technique remains transmitted in various regions as a branch of koryu (classical martial arts).

The Structure of the Kusarigama — Components of Sickle, Chain, and Weight

The kusarigama structure consists of three main components.

The chain attachment point varies by school: it can be attached near the handle grip (tsukagashira) or on the spine side of the sickle, differing according to the particular style. The length of the chain and the weight of the counterweight also vary among different schools; shorter chains are suited for quick entanglement, while longer chains are designed for control at a distance. It is precisely this "diversity of engagement distance" that allowed the kusarigama to occupy a unique position when confronting swords.

How to Use the Kusarigama — The Basics of Weight-Striking and Entanglement

The kusarigama technique consists of roughly three stages.

1. Spinning the Weight and Maintaining Distance

The weight is spun overhead or at the body's side to control the opponent from outside striking distance. The spinning weight itself serves as a striking weapon; when driven at the head or hands, it possesses considerable force.

2. Entanglement

The chain is thrown around the opponent's sword blade, handle, arms, or legs to immobilize their weapon or limbs. Once the chain winds around a sword, the opponent can neither cut nor withdraw it.

3. Drawing In and Sickle Strike

The entangled chain is pulled to unbalance the opponent, the distance is closed, and the sickle is used to finish. The sickle is better suited structurally for hooking and drawing cuts than for direct slashing.

This sequence requires advanced skill. Practitioners must simultaneously master the technique of throwing the chain at the proper speed and angle, possess the physical ability to quickly close distance at the moment of entanglement, and have the judgment to accurately target vital points with the sickle; consequently, training in kusarigama technique is said to require years equal to or exceeding training in sword technique.

The Tactical Relationship Between Kusarigama and Sword — A Weapon Against the Blade

The primary reason the kusarigama occupies a special place in Japanese martial arts history is that it developed as a weapon specifically designed to counter the Japanese sword. When facing a sword head-on, a sickle of agricultural origin would struggle even to enter the sword's effective range. Thus the tactic was devised: use the chain with weight to entangle the sword, neutralize the opponent's weapon, then finish them with the sickle.

However, the kusarigama also had weaknesses. It requires space to swing the chain, making it less effective indoors or in areas with many obstacles; moreover, if the chain misses after being thrown, the user is left vulnerable. This weapon was extremely specialized: its strength (controlling the sword from outside its range) and its weakness (a single failed strike could be fatal) were two sides of the same coin.

Miyamoto Musashi and Shishido Baiken — The Reality Behind the "Kusarigama versus Sword" Legend

The most famous historical confrontation between kusarigama and sword is that between the swordmaster Miyamoto Musashi and a kusarigama wielder. In Musashi's biography "Niten'ki" (compiled in the mid-Edo period), there is an account stating that Musashi fought and defeated a skilled kusarigama master named Shishido (surname given) in the Iga region. The name "Shishido Baiken" given to this "Shishido" was supplied by Yoshikawa Eiji's novel "Miyamoto Musashi" (1930s), and the character of "Baiken" is a fictional creation.

"Niten'ki" was compiled over a century after Musashi's death, and the historical veracity of the confrontation itself is debated. Nevertheless, the very fact that a "kusarigama wielder" was chosen as the legendary swordmaster's opponent is itself evidence that the kusarigama was genuinely respected as a weapon against swords.

Schools and Technical Systems — The Transmission of Kusarigama Technique

Kusarigama technique has been transmitted primarily as an adjunct to other martial arts such as sword technique and staff technique, rather than as an independent discipline. A prominent surviving example is "Issinryu Kusarigama Technique," transmitted alongside Shinto Musokai staff technique. Additionally, schools such as Masaki-ryu transmit techniques using only chain and weight, known as "kusari-fundō" (chain-and-weight or manriki-kusari); the technical system of chain weapons developed while overlapping with kusarigama technique.

Different schools employ varying chain lengths, weight masses, and sickle shapes, with each school's tactical philosophy reflected in its weapon design. Heavy weights allow powerful strikes through inertia but are cumbersome to maneuver, while light weights are nimble but deliver less striking force. These design differences gave rise to distinct specializations among the various schools.

Ninja and the Kusarigama — Between Fact and Exaggeration

In modern times, the kusarigama has a strong association with "ninja weapons" and appears frequently in films, anime, and games. However, from a historical perspective, there is little reliable evidence that the kusarigama was an exclusive ninja weapon. While it is true that ninja (shinobi) used various tools depending on circumstances, limiting the kusarigama to ninja is inaccurate.

Rather, the kusarigama is believed to have spread as a weapon among farmers, country samurai, and martial artists who either could not constantly carry a sword or sought an alternative to the blade. The equation "ninja equals kusarigama" was reinforced after the post-war ninja boom (1960s onward) as a result of prioritizing visual impact over historical accuracy.

Is the Kusarigama Illegal Under Japanese Sword and Firearms Law? — Modern Legal Status

The kusarigama is not subject to the Firearms and Sword Regulation Law's registration system. Registration is required for swords, spears, naginata, and similar implements, but sickles are not included. Therefore, possession of a traditional kusarigama does not require a registration certificate.

However, possession is not unrestricted. Since the sickle blade is a bladed implement, carrying it without legitimate reason violates Article 22 of the Firearms and Sword Regulation Law (prohibition on carrying blades exceeding 6 cm) and Article 1, Section 2 of the Misdemeanor Law. The chain-and-weight component, if carried concealed without legitimate reason, may also violate the Misdemeanor Law and local public nuisance ordinances. In koryu training practice, the kusarigama is typically transported in a tool bag during transit, and for practice sessions, blunted versions or wooden and resin replicas are used.

Was the Kusarigama Actually Used in Combat?

There are few records of the kusarigama being used as a primary weapon in large-scale battles; the dominant weapons on the battlefield were the spear, bow, firearm, and sword. The kusarigama was primarily a weapon for one-on-one martial arts and personal defense; it is most accurate to understand it as having been systematized as a formal martial arts implement during the Edo period.

Where Can One See Authentic Kusarigama?

Authentic kusarigama can sometimes be viewed in the law enforcement tools and ancient weapons sections of local history museums and armor-and-weapon museums throughout the country, and live demonstrations of Issinryu Kusarigama Technique and similar disciplines can be seen at koryu martial arts exhibitions. Antique markets occasionally offer old kusarigama, but determining authenticity and condition—such as the age of the blade or whether the chain has been replaced—is difficult, and expert advice is recommended before purchase.

Conclusion — Diversity Revealed Through the "Opposite" of Sword Culture

While the Japanese sword embodies refined beauty as the "soul of the warrior," the kusarigama—originating from farm tools yet elevated to sophisticated martial discipline—exemplifies the diversity and ingenuity of Japanese weapon culture. The confrontational dynamic of "kusarigama versus sword" provides an essential contrast for discussing the richness of sword culture in Japanese martial arts history.

TOUKENZA's online catalog features numerous Japanese swords within this context of weapon systems. By adding the background of each period's weapon systems to the appreciation of swords and blades, one's understanding of history will deepen.