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The most popular, all-purpose blade: Kogetsu.

Shiori Usami, in Arashiyama Unit 2.[1]

Kogetsu (()(げつ) lit. Arc Moon?) is an Attacker Trigger.


Kogetsu is a slightly curved katana with a luminous yellow blade and no guard. Its gray handle, which is long enough to accommodate two hands, is composed of a series of rectangular tassels and a wider portion roughly one inch long between the grip and the blade. Its scabbard is plain and generally worn with the cutting-edge down.

Yūko Kumagai had her Kogetsu modified to include a cross-shaped tsuba,[2] Kirie Konami to shorten the blade.[3] Yōsuke Yoneya customized his into a sankaku yari,[4] a gray spear measuring roughly six feet in length with tassels much like the regular model's making its shaft easier to grip at the butt and right before the tip, two-fifths of which are hollowed out. Kō Murakami had the color of his Kogetsu changed to black before round seven of the current season of rank battles.[5]


Kogetsu was the first Attacker Trigger to be developed.[6] The members of Old Border appeared to be already equipped with it at the time of the First Large-Scale Invasion.[7]


Shūji Miwa cleaves through Yūma Kuga's Shield.

Kogetsu is considered an all-purpose Attacker Trigger as well as the most balanced one, boasting both high offensive power and durability.[1] It is capable of effortlessly slicing through matter not made out of trion, including metal poles[8] and concrete walls several dozens of centimeters thick,[9] and trion bodies alike.[10] A single swing can crack a Scorpion[11] or even break a transformed one,[12][13] and Aftokrator's armored capes offer no protection against it.[14][15] Although a focused Shield is generally a viable defense,[16] it can be cracked and broken within a short time frame with continued pressure and possibly a high level of skill.[17] However, the barriers generated by an Idra can withstand a high-speed slash.[18] Kogetsu itself is very durable, and it has yet to be seen so much as chipping after repeatedly clashing against itself[19][20][21][22] or any other blade;[23][24][25][26] thus far, only Ikoma Senkū has succeeded at cleaving through both a deactivated Kogetsu and its scabbard.[27]

Unlike Scorpion and Raygust, Kogetsu cannot shapeshift without its Exclusive Optional Trigger Gen'yō.[28] Senkū, a second dedicated Optional Trigger, can briefly extend its blade for vastly increased reach[29] and cutting power.[30] These Triggers are equipped to the same hand as Kogetsu, thus they can be activated while two Triggers are already in use.[31] Kogetsu itself can be turned off in order to use other Triggers without the need to dispel it or put it back in its scabbard, but it will lose its edge completely until selected again. To prevent it from becoming a burden, one may decide to destroy the blade and the sheath and conjure them anew when needed, but the process will consume trion.[32] A new blade can be materialized after the previous one is lost[33] or becomes unfit for use[34] and made to appear inside the pre-existing scabbard.[33]

One of the few downsides to Kogetsu is its weight.[1] The majority of users find themselves off-balance when wielding it with only one hand,[35] and underperform as a result of their swordplay getting slower.[16] However, there are also particularly capable agents who prefer to brandish it with only one hand,[36][37][38][39] presumably suggesting that skill can offset the Trigger's weight. A very circumstantial drawback of Kogetsu is that it has a luminescent blade, which can be easily spotted in the darkness;[40] however, the glow can be removed by setting its color to black[5] with the help of an Engineer.[41] Since it interferes with Lead Bullet,[42] Kogetsu is in all likelihood a physical object.[43]


Image Name Description
Tachikawa and Murakami attack Gatlin.gif Double Senkū Kogetsu
(ダブル(せん)(くう)()(げつ) Daburu Senkū Kogetsu?)[31]
The user activates Senkū through both the Main and the Sub while wielding two Kogetsu.[31] This technique was very likely used by Kei Tachikawa to effortlessly cut down an Ilgar,[44] whose already durable armor was enhanced as it was ready to self-destruct.[45]
Ikoma Senkū
(()駒旋空(こませんくう)(こま) (せん)(くう) Ikoma Senkū?)[46]
By activating Senkū for a mere 0.2 seconds, the user can extend the reach of their Kogetsu up to 40 meters. This complex technique, which requires the user to swing their sword extremely quickly while synchronizing the slash with the activation of Senkū, is named after Tatsuhito Ikoma, the only person in Border capable of using it.[47]


See also: Kogetsu Users

There are 28 known agents with at least one Kogetsu chip in their Trigger Set.[48] The number rises to 29 if Yoneya's spear, which has a slightly different name,[4] is classified as a customization and not a separate Trigger. No. 1 Attacker and solo combatant Kei Tachikawa is an especially noteworthy user,[49] as is his teacher, Director Masafumi Shinoda, hailed as the strongest normal Trigger user at HQ.[50] Kogetsu is also used by an unknown number of trainees and agents who do not take part in rank battles.

Particularly notable among former users are Kirie Konami, who surpassed even Tachikawa in points before withdrawing from rank battles,[3] Yūichi Jin, previously the no. 2 Attacker and solo combatant,[51] and Raizō Terashima, a high-ranking Attacker who became an Engineer.[52]


  • The author confessed that the sudden disappearance of a Kogetsu is due to him forgetting to draw it.[53]
  • The concept of a black Kogetsu was teased by the author in the official databook[41] prior to its appearance in the series.[54]


  1. 1.0 1.1 1.2 1.3 World Trigger Manga Chapter 26 (p. 5)
  2. Daisuke Ashihara: Q153: Kumagai’s Kogetsu has a guard, can the design of any part that isn’t the blade be freely changed? A: Consult with the Engineers, and it can be freely changed to an extent. Kumagai blocks with her sword a lot, so a guard was attached to protect her hands.
    Source: Border Briefing File, Question 153
  3. 3.0 3.1 Daisuke Ashihara: Q: Konami is the no. 3 Attacker, does this mean she shows up in the solo rank wars? And in that case what Triggers does she use? A: Studying came first for Konami up until the end of her middle school years so she didn’t do any solo rank wars then, and only participated in the period from her middle school graduation and part way through her first year of high school. Back then, in that period, Jin had become a Black Trigger user and Tachikawa had kind of lost his motivation, so Konami sharpened her blades against those like Kazama to reach all the way to Attacker rank no. 1. After that, along with Tamakoma’s separation, she took a step back from rank wars, but her solo points have only been surpassed by Tachikawa and Kazama so she’s still Attacker no. 3. Her Triggers at the time were dual-wielded Kogetsu (fairly short).
    Source: Question Corner 15, Volume 20
  4. 4.0 4.1 World Trigger MangaBorder Briefing File (p. 81)
  5. 5.0 5.1 World Trigger Manga Chapter 169 (p. 9)
  6. World Trigger Manga Chapter 27 (p. 9)
  7. World Trigger Manga Chapter 1 (p. 7)
  8. World Trigger Manga Chapter 97 (p. 5)
  9. World Trigger Manga Chapter 175 (p. 5)
  10. World Trigger Manga Chapter 189 (p. 12)
  11. World Trigger Manga Chapter 90 (p. 5)
  12. World Trigger Manga Chapter 98 (p. 10)
  13. World Trigger Manga Chapter 114 (p. 8)
  14. World Trigger Manga Chapter 76 (p. 8)
  15. World Trigger Manga Chapter 76 (p. 10)
  16. 16.0 16.1 World Trigger Manga Chapter 99 (p. 7)
  17. World Trigger Manga Chapter 99 (p. 6)
  18. World Trigger Manga Chapter 129 (p. 10)
  19. World Trigger Manga Chapter 97
  20. World Trigger Manga Chapter 98
  21. World Trigger Manga Chapter 99
  22. World Trigger Manga Chapter 153
  23. World Trigger Manga Chapter 129 (p. 4-5)
  24. World Trigger Manga Chapter 130 (p. 8)
  25. World Trigger Manga Chapter 133 (p. 13)
  26. World Trigger Manga Chapter 153 (p. 11)
  27. World Trigger Manga Chapter 157 (p. 10)
  28. World Trigger MangaBorder Briefing File (p. 154)
  29. World Trigger Manga Chapter 26 (p. 5-6)
  30. World Trigger Manga Chapter 57 (p. 11)
  31. 31.0 31.1 31.2 Daisuke Ashihara: Q167: Do Exclusive Options not count in the "only two Triggers at a time" limit? A: They don’t. Exclusive Options, like Kogetsu’s exclusive Senkū, are equipped on the same side of the slots as Kogetsu, and only switched on when in use (the trion consumed is only what the Exclusive Option used). Dual-wielding Kogetsu + (Senkū x 2) for a Double Senkū Kogetsu is also possible.
    Source: Border Briefing File, Question 167 Cite error: Invalid <ref> tag; name "BBFQ167" defined multiple times with different content
  32. Daisuke Ashihara: Q: During the battle versus Lamvanein, Okudera used Full Guard; does that mean you can use other Triggers if you just put Kogetsu in a sheath without deactivating it? A: Even without putting it in a sheath you can turn Kogetsu off, but the sharpness will become zero. You won’t be able to use it and you can’t deactivate it either so it’s a big hindrance. Deactivating the Kogetsu and then remaking one later when you need it again will mean it’s not a hindrance, but it will use up trion. It is the same as Gun-type Triggers.
    Source: Question Corner 9, Volume 10
  33. 33.0 33.1 World Trigger Manga Chapter 114 (p. 17-18)
  34. World Trigger Manga Chapter 157 (p. 13)
  35. World Trigger Manga and Anime Vol. 16 Chapter 139 (p. 7) and Episode 78.
  36. World Trigger Manga Chapter 15 (p. 4)
  37. World Trigger Manga Chapter 90 (p. 2-3)
  38. World Trigger Manga Chapter 114 (p. 2-3)
  39. World Trigger Manga Chapter 159
  40. World Trigger Manga Chapter 168 (p. 21)
  41. 41.0 41.1 Daisuke Ashihara: Q195: The trion body's uniform or hairstyle can be set as anything. Can a Trigger (weapon)’s color or ornaments be set? A: If the request is given to an Engineer, it can be. A black Kogetsu or something seems like it’d be pretty cool.
    Source: Border Briefing File, Question 195
  42. World Trigger Manga Chapter 157 (p. 12)
  43. Daisuke Ashihara: Q: Can Escudo defend from Lead Bullets? A: Escudo converts trion into a material form, so it can. It is treated the same as blocking Lead Bullets with walls or buildings.
    Source: Question Corner 11, Volume 18
  44. World Trigger Manga Chapter 48 (p. 5)
  45. World Trigger Manga Chapter 48 (p. 9)
  46. World Trigger Manga Chapter 153 (p. 19)
  47. World Trigger Manga Chapter 154 (p. 5)
  48. World Trigger MangaBorder Briefing File
  49. World Trigger Manga Chapter 160 (p. 7)
  50. World Trigger Manga Chapter 31 (p. 11)
  51. World Trigger Manga Chapter 27 (p. 10)
  52. Daisuke Ashihara: Q155: Please tell us when Raygust was developed as well as the story behind its development. A: Raizō Terashima (18), a top-class Kogetsu wielder at the time, got pissed off at the enhancing and popularity of bullet Triggers and transferred to Engineer, where he made Raygust as an anti-bullet blade with Shield and Scorpion as the base. This was when Raizō gained weight.
    Source: Border Briefing File, Question 155
  53. Daisuke Ashihara: Q: Can you not put away the Kogetsu only while it's selected, or the whole time the Trigger is on? A: Once the Kogetsu is selected, it is always out. It disappears in the art sometimes, but that's just me forgetting to draw it.
    Source: Question Corner 5, Volume 7
  54. World Trigger Manga Chapter 167 (p. 19)


Border Triggers
Basic Equipment Bail OutRadarTrion Body
Attacker Kogetsu (Kogetsu: Spear) • Raygust (Shield Mode) • ScorpionSōgetsu (Axe)
Gunner AsteroidCobraGimletHornetHoundMeteorSalamanderTomahawkViper
Firearms Assault Rifle • Grenade Launcher • Handgun • Minigun • Shotgun
Sniper EgretIbisLightning
Defense EscudoShield (Fixed Mode/Full Guard)
Trap Switchbox
Optional BagwormBagworm TagChameleonConnectorDummy BeaconEnhanced RadarFull ArmsGeistGen'yōGrasshopperIdatenLead BulletMakōSenkūSilencerSpiderStarmakerTeleporterThrusterTimer
Prototypes ConnectorDummy BeaconFull ArmsGeistIdatenMakōTeleporterTimer
Black FūjinTsukihiko Amō's Black TriggerYūma's Black Trigger