The world is over taken with a very deadly disease that turns humans into zombies. In Japan, several students of Fujimi High School, and the school nurse, band together to survive the present apocalypse. The story follows Takashi Komuro, one of the students who survived in the initial outbreak.
The following weapons were used in the anime High School of the Dead:
Takashi and Rei find two Smith & Wesson Model 37s on a pair of dead police officers, though one has it's handle broken. Takashi later hands the revolver to Kohta to compensate for his physical weakness. Several police officers are seen firing their M37s at zombies trying to breach their roadblocks and a senior officer executes a anarchist inciting a unruly mob on live television before the officer later commits suicide with his sidearm near other officers. The author comments on how the Nambu Model 60 was no longer the official sidearm for all Japanese police officers and therefore chose the Smith & Wesson to show the unique choice of weapon for each department.
SIG Sauer P226R
In episode 7, a Secret Service agent uses the pistol to gun down zombies trying to reach the wounded President and Chairman of the Joint Chiefs alongside a few remaining staff members. A male staff member is armed with the P226R to shoot the wounded Chairman in the head after he shows signs of zombification.
Browning M1910
Only seen in the opening sequence.
Shotguns
Remington 870
Yakuza members are seen running amok with Remington 870s. A flashback reveals Kohta trained with one while on vacation in the US undergoing a firearm's training course.
Ithaca M37
A Ithaca 37 is found in Minami's household after being stolen from a firearms locker which Takashi and Kohta broke into. Kohta initially uses it as his main weapon before handing it to Takashi. Saya uses the dropped M37 to fight the zombies at the wire blockade. Takashi later uses it a melee weapon after running away from the wire blockade in the anime series.
Over and Under Shotgun
A citizen is seen firing a shotgun, but fumbles in loading the shells and is promptly surrounded and devoured by zombies.
Submachine Gun
Heckler & Koch MP5A4
Riot Police (機動隊 Kidotai) officers are seen firing Heckler & Koch MP5A4s at zombies.
Rifles
Springfield Super Match M1A
A Springfield Super Match M1A is found in Minami's household with rails attached for a Surefire foregrip and an Aimpoint red dot sight,and a foregrip. Rei handles the M1A as her main weapon. In episode 7, Takashi handles the rifle to snipe at zombies about to eat Rei. Hirano, like in the Manga, incorrectly calls it an M1A1 with the extra 1 number. There's an inconsistency with the charging handle. One scene it is shown as an incredibly oversize charging handle that can fit the size of an entire hand and then for the rest of the series, it's in its normal size.
Armalite AR-10 A4
A Armalite AR-10 A4 is found in Minami's household that has been converted to a Knight's Armament SR-25. Kohta uses it as his primary weapon. The author comments Minami seduced an American soldier to import the illegal rifle into Japan via the American military air service avoiding customs.
Howa Type 89
JGSDF soldiers are seen wielding Howa Type 89s as their service rifle.
AK-74
A AK-74 is seen in use in Hirano's FPS game imagination.
Sniper Rifle
Heckler & Koch PSG-1
Sergeant Minami uses a Heckler & Koch PSG-1 in her role as a Special Assault Team sniper, clearing an airport of zombies wandering around its runways.
Machine Guns
Sumitomo Minimi
A Sumitomo Minimi LMG, the Japanese-licensed version of the FN Minimi, is seen mounted on a JGSDF Type 82 CBRN reconnaissance vehicle.
Sumitomo M2
A Sumitomo M2, the Japanese-licensed version of the Browning M2, is seen mounted on a JGSDF Type 10 MBT.