Guided bullets that pursue their target: Hound.

Shiori Usami about Hound.[1]


Izumi Hound

Kashio Hound

Kanji 誘導弾
Rōmaji Haundo
Organization BrDr Border
Type White trion Normal
Classification Hound icon Gunner
- Homing projectiles
First Appearance
Manga Chapter 29
Anime Episode 15

Hound (誘導弾(ハウンド) or 追尾弾(ハウンド) Haundo?, lit. Guided Bullet and Tracking Bullet) is a Gunner Trigger. Its properties change slightly depending on whether it is set to Detection Guidance (探知誘導) or Visual Guidance (視線誘導).[2]


Hound is a projectile which appears as a luminous trail once shot, and which curves to pursue the target. The size of each bullet is directly proportional to the amount of trion the user has. Gunners fire Hound bullets through different types of gun-shaped Triggers, whereas Shooters form a trion cube that can be divided in smaller regular polyhedrons, their size and shape depending on how many are created at once.

Nozomi Kako's customized version[3] is peculiarly sphere-shaped. Instead of dividing, it spawns "bubbles" which can be split in smaller ones.[4]


The origins of this Trigger are unknown. It was first used by Shooters only, until firearm Triggers were invented.[5]

Abilities Edit

Hound is slightly less powerful than Asteroid,[6] but it has the ability to shoot bullets which automatically pursue the target.[1] It is possible to select between a trion-seeker mode, which causes the bullets to home in on trion bodies, and a guided homing mode, which is directed by eyesight and more precise.[6][7] These functions are disabled at high muzzle velocity.[6] It is possible to lock on multiple targets at once,[8] and, by setting it to seek out trion bodies, it can pursue opponents who are using Chameleon.[9]

Hound is a Trigger that is especially dangerous outdoors, where walls do not limit its movements.[10] The absence of obstacles make it possible to angle the bullets in such a way that they can hit an opponent behind a flat Shield.[11] Shooters can also fire multiple projectiles at the same time so they all attack the target from a different direction, making it even harder to defend oneself.[4] Hound also allows the user to exploit the presence of structures that restrict vision: they can in fact shoot over said obstacle, after which the bullet will home in on the target, catching them by surprise.[12] Even if the opponent manages to block the projectiles, their attention will be diverted, leaving them open to follow-up attacks from other angles.[13] Yet another possible application of Hound is the bombardment of an area through Radar,[14] which is also a second method to counter Chameleon users.[9]

Aside from its unique shape and division method, any additional abilities possessed by the customized Hound used by Kako are still unknown.

Combined with Meteor, Hound can create the composite bullet Salamander, which pursues the target and explodes on impact.[15] The merging of two Hounds takes the name of Hornet.[16] Its characteristics are still unknown.


Name Description
Hound storm anime Hound Storm (追尾弾嵐(ハウンドストーム) Houndo Sutōmu?) A powerful collaborative technique in which multiple members of the same unit use Hound in Full Attack.[17] It was created by Mamiya Unit.[17]


See also: Hound Users

Hound has 26 known users among official agents, which makes it the second most popular Gunner Trigger, after Asteroid. 12 of its users fire it as Shooters and 13 as Gunners, of which 9 use it in conjunction with an assault rifle and 4 with a handgun.[18] However, this list excludes those members of branches who do not participate in rank battles.[19] Recurring users who have yet to reach B-rank are Teruteru Kōda and Fumifumi Saotome.[20] Chika Amatori is notable for her combination of Lead Bullet and Hound.[21] Nozomi Kako has a customized version of this Trigger.[3]


  • The author stated that the two different sets of kanji used in the Trigger's name were supposed to reflect which mode is in use at the moment of firing: "誘導弾" ("guided bullet") when set Detection Guidance, "追尾弾" ("tracking bullet") when set to Visual Guidance. However, he admits to making many mistakes with the nomenclature.[2]
  • Like many other Gunner Triggers, Hound is named after a missile: possibly the AGM-28 Hound Dog or the Bloodhound.
    • A hound is a dog whose main purpose is to aid hunters by tracking prey by scent, similar to how this Trigger tracks and follows an opponent.
  • Sumiharu Inukai is the only known official agent to use Hound both as a Gunner and as a Shooter.[22]


  1. 1.0 1.1 1.2 World Trigger Manga Chapter 29 (p. 5)
  2. 2.0 2.1 Daisuke Ashihara: Q: Up to the Large Scale Invasion Arc, Hound was written with the kanji for "guided bullet", but from rank wars it’s written with the kanji for "tracking bullet"; why is this? A: "Detection guidance" which chase trion responses is written "guided bullet", and "visual guidance" which locks on to the target with line of sight is written "pursuing bullet", but there are quite a few mistakes here and there so don’t worry about it.
    Source: Question Corner 15, Volume 20
  3. 3.0 3.1 World Trigger MangaBorder Briefing File (p. 72)
  4. 4.0 4.1 World Trigger Manga Chapter 127 (p. 4)
  5. World Trigger MangaBorder Briefing File (p. 305)
  6. 6.0 6.1 6.2 World Trigger Manga Chapter 30 (p. 19)
  7. World Trigger MangaBorder Briefing File (p. 215)
  8. World Trigger Manga Chapter 156 (p. 2)
  9. 9.0 9.1 World Trigger Manga Chapter 82 (p. 19)
  10. World Trigger Manga Chapter 150 (p. 16)
  11. World Trigger Manga Chapter 145 (p. 9-10)
  12. World Trigger Manga Chapter 101 (p. 13-14)
  13. World Trigger Manga Chapter 62 (p. 15-16)
  14. World Trigger Manga Chapter 115 (p. 2-3)
  15. World Trigger Manga Chapter 153 (p. 7)
  16. World Trigger MangaBorder Briefing File (p. 304)
  17. 17.0 17.1 World Trigger Manga Chapter 86 (p. 12)
  18. World Trigger MangaBorder Briefing File
  19. World Trigger Manga Volume 18
  20. World Trigger Manga Chapter 38 (p. 8)
  21. World Trigger Manga Chapter 145 (p. 7)
  22. World Trigger MangaBorder Briefing File (p. 106)


e - d - vBorder Triggers
Basic Equipment Bail OutRadarTrion Body
Attacker Kogetsu (Kogetsu: Spear) • Raygust (Shield Mode) • ScorpionSōgetsu (Axe)
Gunner Asteroid • Cobra • Gimlet • Hornet • HoundMeteorSalamanderTomahawkViper
Firearms Assault Rifle • Grenade Launcher • Handgun • Minigun • Shotgun
Sniper EagletIbisLightning
Defense EscudoShield (Affixed Mode/Full Guard)
Trap Switchbox
Optional Bagworm • Bagworm Tag • ChameleonConnector • Dummy Beacon • Enhanced Radar • Full ArmsGeistGen'yōGrasshopperIdatenLead Bullet • Makō • Senkū • Silencer • SpiderStarmakerTeleporterThruster • Timer
Prototypes Connector • Dummy Beacon • Full ArmsGeistIdaten • Makō • Teleporter • Timer
Black Fūjin • Tsukihiko Amō's Black Trigger • Yūma Kuga's Black Trigger
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