Kogetsu

• Kogetsu
• Spear
• Senkū
• Gen'yō
• Users
• Image Gallery

“	The most popular, all-purpose blade: Kogetsu.	”
–Shiori Usami, in Arashiyama Unit 2.

Kogetsu
Name
Kanji	弧月
Romaji	Kogetsu
About
Creator	Unknown
Organization	Border
Attributes
Type	Normal
Class	Attacker
Ability
-	High attack power
-	Durable blade
First Appearance
Manga	Chapter 14
Anime	Episode 7

Statistics
Offensive Power	A
Durability	A
Lightness	C
Type	Balance

Kogetsu (弧月(こげつ), Kogetsu ^? lit. Arc Moon) is an Attacker Trigger.

Appearance

Kogetsu is a slightly curved katana with a luminous yellow blade and no guard. Its 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. Yōsuke Yoneya customized his into a sankaku yari, a spear measuring roughly two meters 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.

Overview

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

Abilities

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

Unlike Scorpion and Raygust, Kogetsu cannot shapeshift without its Exclusive Optional Trigger Gen'yō. Senkū, a second dedicated Optional Trigger, can briefly extend its blade for vastly increased reach and cutting power. These Triggers are equipped to the same hand as Kogetsu, thus they can be activated while two Triggers are already in use. 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 avoid it 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. A new blade can be materialized after the previous one is lost or becomes unfit for use and made to appear inside the pre-existing scabbard.

One of the few downsides to Kogetsu is its weight. The majority of users find themselves off-balance when wielding it with only one hand, and underperform as a result of their swordplay getting slower. However, there are also particularly capable agents who prefer to brandish it with only one hand, 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; however, the glow can be removed by setting its color to black before entering one's trion body. Since it interferes with Lead Bullet, Kogetsu is in all likelihood a physical object.

Techniques

	Name	Description
	Double Senkū Kogetsu (ダブル旋空弧月(せんくうこげつ), Daburu Senkū Kogetsu ?)	The user activates Senkū through both the Main and the Sub while wielding two Kogetsu. This technique was very likely used by Kei Tachikawa to cut down an Ilgar, whose already durable armor was enhanced as it was ready to self-destruct.
	Ikoma Senkū (生駒旋空(いこませんくう), Ikoma Senkū ?)	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.

Users

See also: Kogetsu Users

Many Old Border agents used this Trigger. Currently, there are 28 known official agents (B-rank and above) with at least one Kogetsu in their Trigger set, including Hyuse; if Yōsuke Yoneya's modified Kogetsu is included in the list, the number goes up to 29. Among HQ personnel, Masafumi Shinoda, believed to be HQ's strongest Trigger user and Kei Tachikawa's swordsmanship teacher, deserves to be mentioned as well. A recurring user who is not an official agent is Hidehide Hinoe. The list excludes those members of branches who do not participate in rank battles.

The Kogetsu user with the most Solo Usage Points is Kei Tachikawa, the no. 1 Attacker and solo combatant. Yūichi Jin, Raizō Terashima and Kirie Konami are notable among the former users of this Trigger.

Trivia

• According to the author, sometimes, when a Kogetsu suddenly disappears, it is because he has forgotten to draw it.
• The concept of a black Kogetsu was teased by the author in the official databook prior to its appearance in the series.