Daidaimaru

"Soiya! Orange Squash!"

- Standard finisher announcement via Sengoku Driver

"Lock On! 1, 10, 100, 1,000, 10,000! (Blood) Orange Charge!"

- Naginata Mode's finisher announcement via Musou Saber

The Daidaimaru (大橙丸) is Kamen Rider Gaim and Kamen Rider Fifteen's weapon while in Orange Arms and Gaim Arms respectively, which is a sword that has the blade look like a slice of an orange. This weapon is accessed through the Orange and Heisei Rider Lockseeds. However, it can be summoned and utilized by Gaim if he assumes Kiwami Arms.

Combinations
The Daidaimaru can combine with the Musou Saber for the more powerful Naginata Mode (ナギナタモード).

Finishing attacks

 * Daidai Ittou (大橙一刀): After Gaim activates his Sengoku Driver's Squash function, he charges the Daidaimaru with energy before unleashing a series of slashes on the target.
 * Naginata Musou Slicer (ナギナタ無双スライサー): By inserting either the Orange Lockseed or Blood Orange Lockseed into the Daidaimaru Naginata Mode's Drive Launch and locking it in place, Gaim or Bujin Gaim can execute a variation of this attack.
 * Orange Charge (オレンジチャージ): Gaim fires energy slashes from the Musou Saber end at the enemy, trapping them in an orange sphere. Afterwards, he charges the Daidaimaru end with energy before slashing the enemy with it. The Orange Charge has two variations for close-quarters combat; a multiple slash version that is used for separate targets and a 360 degree turn slash version that forms orange slices on contact with the target.
 * Blood Orange Charge (ブラッドオレンジチャージ): Bujin Gaim charges the Daidaimaru end with energy before he slashes the enemy with it. The Blood Orange Charge has two variations; a straight slash version for a single target and a circle slash version for multiple targets.

Other versions

 * A crimson version of the Daidaimaru is wielded by Kamen Rider Bujin Gaim while in Blood Orange Arms.
 * Two Daidaimaru are the weapons of choice for Kamen Rider Gaim when using Fresh Orange Arms.