The Karakuri Sword is a katana belonging to the Beasts Pirates headliner Holed'em. Its owner regards it as something special, and outside the manga it proves to hide a mechanism that lets the blade behave like a flexible whip.
Karakuri Sword, whose name points to a trick-mechanism design, is the katana wielded by Holed'em of the Beasts Pirates. The weapon carries a star-shaped golden guard, a gray scabbard marked with a paler circular pattern, and a handle of the same gray tone stamped with rows of black diamonds. Holed'em himself calls it a special sword.
In the canon material little is confirmed beyond the owner's own praise for the blade. The anime expands on it, showing that the katana can break apart into tiny linked segments to form a whip while remaining remarkably tough, durable enough to be set ablaze by Kamijiro without being destroyed. This whip configuration powers an anime-exclusive technique, Hellfire Edge, in which Holed'em coats the segmented blade in Kamijiro's flames and lashes his opponent with the burning length.
Holed'em is the only character shown using the Karakuri Sword. His fellow headliner Sasaki carries a comparable mechanized weapon, the Karakuri Rasento, which works as a spinning drill rather than a whip.

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The Karakuri Sword, also called Karakuri-to, is the katana belonging to Beasts Pirates headliner Holed'em, featuring a star-shaped golden guard and a gray scabbard with a pale circular pattern.
In the anime, the Karakuri Sword can break apart into tiny linked segments to form a whip while staying remarkably tough, durable enough to survive being set ablaze by Kamijiro without being destroyed.
Holed'em's anime-exclusive technique Hellfire Edge coats the segmented, whip-like Karakuri Sword in Kamijiro's flames and lashes his opponent with the burning length.
Holed'em, a headliner of the Beasts Pirates, is the only character shown wielding the Karakuri Sword, which he calls a special sword.
The Karakuri Sword resembles the Karakuri Rasento carried by fellow Beasts Pirates headliner Sasaki, another mechanized blade, though Sasaki's weapon works as a spinning drill rather than a whip.
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