Geobreeders (1998) and Geobreeders: Breakthrough (2000) are two OVA series based on Akihiro Ito's on-going manga of the same name. The story depicts members of Kagura Total Security as they fight against the Phantom Cats. Kagura's main business rival is Hound, a secret government paramilitary organization under the control of the Ministry of Health and Welfare.
Phantom Cats are mystical beings capable of taking both human and feline forms as well as manipulating all form of electronic signals. This ability makes the cats master of information manipulation. Physical attack against the cats in human form will not permanently harm them as the cats have the ability to regenerate in human form. The Hound's equipped with special EM field generators that, when deployed, can neutralized Phantom Cats' abilities such as regeneration or escape through telephone lines. In order to eradicate them, Cats needs to be "sealed" using specially designed tags or other devices.
The OVA storylines are considered canon and are incorporated into the main manga story.
The following weapons are seen in the anime Geobreeders and it's sequel Geobreeders: Breakthrough
A pair of Mauser M712 Schnellfeuer pistols are Kagura member Maki Umezaki's weapons of choice. Umezaki (who calls herself the Crimson Shooting Star) is usually seen firing them akimbo.
.
Browning Hi-Power
In Geobreeder: Breakthrough, Umezaki's rival (who calls herself the Indigo Shooting Star) uses a pair of heavily customized Browning Hi-Power pistols as her sidearms.
SIG P226
The SIG-Sauer P226 is Hound's standard issued sidearm. Several P226s fitted with laser aiming devices are also used by Irie's agents.
SIG P228
Ayumi Narusawa, the only female Hound member, uses a SIG-Sauer P228.
Beretta 92F
Some of the assassins attempting to kill Irie are armed with Beretta 92F pistols.
Makarov PM
Alberto, the leader of the rogue Phantom Cats in Breakthrough, used a Makarov PM when he held Narusawa hostage.
SEAL operators disguised as a mailman, delivery man and vegetable salesman attack Kagura's office with MP5K PDW submachine guns. The PDW stocks are removed for better concealment.
M1928 Thompson
During the assault on the Russian cargo ship, Umezaki is seen firing a M1928 Thompson Submachine gun at the Phantom Cats.
MP40
After Umezaki's Thompson runs out of ammo on the Russian cargo ship, Yu Himehagi hands her a MP40, which she uses to take out several Phantom Cats.
SA Vz.61 Skorpion
Her MP40 presumably also out of ammo, Umezaki was seen with a Vz.61 Skorpion submachine gun.
Sterling Patchett Suppressed version
Indigo Shooting Star uses a Sterling Patchett Suppressed version submachine gun when attacking Kagura's van on the freeway in Breakthrough. When she runs out of ammo, she simply discards the Sterling and picks up another.
The old man who takes the Kagura crew in during Breakthrough keeps a stash of Soviet weapons under his living room tatami, which include at least two PPSh-41 submachine guns. Kagura company president Yuka Kikushima uses one during the fire fight.
Unknown Submachine gun
Rifles
SIG SG 551
The SIG SG 551 assault rifle is the standard assault weapon of Hound. During Hound's assault on the DDK building, some of the SG 551s are fitted with tactical lights or laser aiming devices.
AKS-47
The Phantom Cats used smuggled AKS-47 assault rifles as their main weapons.
M4A1
Indigo Shooting Star used an M4A1 fitted with a scope in a failed attempt to kill Umezaki. Her M4A1 is later seen with a M203 grenade launcher.
M16A1
In a continuity error, Indigo Shooting Star's primary weapon switches from a M4A1 to a M16A1 (also fitted with a M203 grenade launcher) during the fire fight in the old man's house,.
Sniper Rifles
Walther WA 2000
Indigo Shooting Star uses a Walther WA 2000 sniper rifle in her first attempt to take out Umezaki, intentionally shooting Umezaki's hat off and rupturing the gas line of Kagura's office. The ruptured gas line causes an explosion when Himehagi lights a cigarette.
Remington Model 700
Hound snipers used Remington Model 700 during the assault on the DDK building.
Lahti L-39
During the SEALs raid on Kagura's office, Umezaki pulls out a Lahti L-39 anti-tank rifle, but is unable to use it due to the AH-1W's 20mm suppressive fire. In order to increase her firepower, she modifies the L-39 to accept a drum magazine and turns it into a makeshift heavy machine gun, which was considered reckless by the owner of the machine shop where she finished her modification. The English DVD incorrectly translated it as "Ratti machine gun".
Denel NTW-20
In a final attempt to kill Umezaki, Indigo Shooting Star uses a Mechem NTW-20 anti-material rifle to shoot the natural gas pipe line near the hot spring where Umezaki was taking a bath, and the gas is ignited by Himehagi's cigarette.
Machine Guns
MG34
During the attack on the Russian cargo ship, Umezaki fires a MG34 machine gun from Kagura's ship.
PKM Machine Gun
During the assault on the DDK building, the Phantom Cats use a PKM machine gun to fight off the Hound.
M240D
During the shootout, Indigo Shooting Star uses a remote controlled M240D machine gun to lay down suppressing fire.
GE M134
Hound's V-22 Osprey is armed with a GE M134 minigun. During the attack on the DDK building, the M134 is used to destroy the water tanks on top of the building to stop the sprinkler system.
Browning M2HB
A Browning M2HB heavy machine gun is seen mounted on top of the turret a JGSDF Type 90 tank stolen by the Cats. Hound also deploy M2 machine guns on their personnel transports (disguised as garbage trucks) during the attack on the DDK building.
General Dynamics M197 Vulcan
A disguised USMC AH-1W Super Cobra uses its M197 20mm gun to cover the SEAL team's extraction. It was referred to as "20mm Vulcan" by Umezaki and Eiko Rando. In the US DVD release it was incorrectly translated as "20mm Balkan".
General Dynamics GAU-12 Equalizer
The USMC AV-8B Harriers IIs seen are armed with GAU-12 25mm gun pods. A Harrier hijacked by the Cats is used to shoot down two other Harriers and strafe the Hounds.
ZPU-1
Phantom Cats on the Russian cargo ship fire a ZPU-1 anti-aircraft machine gun at Hound's chopper, but fail to shoot it down.
Launchers
Heckler & Koch HK69
Hound uses modified HK69A1 grenade launchers to fire special grenades that allow them to seal the Phantom Cats. HK69A1s are also used to fire smoke grenades.
Milkor MGL
During the assault on the Russian cargo ship, Umezaki fires several HE grenades from her Milkor MGL launcher, but fails to breach the hull of the ship.
M203
Two M203 grenade launchers are seen fitted on Indigo Shooting Star's M4A1 and M16A1 rifles.
RPG-7
A RPG-7 can be seen in Umezaki's office locker, but is destroyed by the AH-1W's 20mm fire before it can be used. Several Phantom Cats are also armed with RPG-7s during the attack on the DDK building.
M72 LAW
The Hound commander Captain Yashima fires a modified M72 LAW to seal the Phantom Cat that hijacks the Harrier.
Hand Grenades
M67 Grenade
Kagura employee Takami Sakuragi's weapon of choice is a balisong (butterfly knife) with a M67 hand grenade attached to it.
M61 Grenade
The SEALs that attack Kagura's office use a M61 hand grenade to initiate their attack.
F-1 Hand Grenade
The old man's secret stash includes several Russian F-1 hand grenades. Sakuragi uses one of these grenades during the shootout.
RGD-33 Stick Grenade
Besides the F-1s, the majority of the old man's grenade collection are RGD-33 stick grenades.