Lethal Enforcers 3, known as Seigi no Hero (セイギノヒーロー or 正義のヒーロー—Heroes of Justice) in Japan is a 3D arcade light gun game which is the third installment to Konami's Lethal Enforcers series.
In Lethal Enforcers 3, players play as six different law enforcement roles in various scenarios in present day Tokyo, Japan. Players make their ways to checkpoints while shooting criminals, terrorists, or fugitives along the way.
Lethal Enforcers 3 is similar to World Combat which players shoot outside the screen to activate the shield. Unlike Warzaid, simply pointing outside the screen performs the same shield-activating mechanism as described herein. Raising the shield guard allows players to protect themselves from incoming bullets at the expense of not moving forward.
Unlike Lethal Enforcers and Lethal Enforcers II: Gunfighters, players must compete with other in making their way to checkpoints in various areas and capturing the wanted criminals allowing their ranks to be promoted. Also, players do not lose lives when they shoot innocent civilians but rather have their ranks demoted.
Much of the game's gameplay and mannerisms are reminiscent of Police 911, so much to the point where it could be considered a quasi-sequel.
Lethal Enforcers 3/Seigi no Hero allows the player to play the stages in the order they desire (with the exception of the Diet Building a.k.a. "Lethal Enforcers 3/Seigi no Hero" stage). There are 6 stages in all with 5 selectable at the beginning of the game.
Cops in the City
Note: This stage is called "The Keisatsukan: Mass line of duty during noon" in Japan
- Player character: Tokyo police officers
- Suspect: Man Tak Wah (文 徳華)
- Munitions: Nanbu M60 revolver (15 rounds)
- Date: 2004-02-02
- Location: Akihabara
The premise of this stage is to guide two Japanese police officers to chase after Man Tak Wah, a Chinese wanted burglar. The stage's BGM is borrowed from "Police 911" and will take the player through the streets of Akihabara, through the shopping malls, and finally a parking garage.
Note: This stage is called "A desperate act to stop a rogue boat by the Maritime Safety Agency" in Japan
- Player character: Special Security Team officers from the Japanese Coast Guard
- Suspect: Akihito Kawanishi (河西 顕仁 Kawanishi Akihito)
- Munitions: 10-round Glock and HK MP5
- Date: 2004-04-11
- Location: Shinagawa pier
Special Security officers from the Japan Coast Guard must stop a boat carrying illegal narcotics, subdue members from the Hong Kong mafia Ryuuto, and capture drug dealer Akihito Kawanishi to protect Japan from the threat of illegal narcotic distribution.
Note: This stage is called "Rival Detectives" in Japan
- Player character: "Masa" and "Yoshi", two rival Japanese detectives
- Suspect: Masaru Yoshioka (吉岡 賢 Yoshioka Masaru)
- Munitions: 10-round Glock and a pump-action shotgun
- Date: 2004-07-11
- Location: Tocho-mae Station and its underground area
Two rival detectives (Masa and Yoshi) must follow Gokudo-Kai executive Masaru Yoshioka, arrest any mafia remnants throughout the chase, and terminate an underground weapon smuggling network before guns can be distributed to world-class criminals.
Note: This stage is called "Thrust inside the airport!" in Japan
- Player character: Mobile riot troopers
- Suspect: Tetsuya Nakamura (仲村 哲也 Nakamura Tetsuya)
- Munitions: 10-round Glock and sniper-modified Howa Type 64
- Date: 2004-10-15
- Location: Narita International Airport
Riot troopers representing the Special Investigation Team are sent to stop the violence occurring throughout Narita International Airport. Violent Uyoku (Japanese right-wing) militants called the Bakudankakumeirengou (爆弾革命連合) must be removed from both short- and long-range to resume peaceful diplomacy in Japan.
Justice and Judgment
Note: This stage is called "Lethal Enforcers 3" in Japan
- Player character: JGSDF's Japanese Special Forces Group troopers
- Suspect: Kifaf Nadhir
- Munitions: 10-round Glock and Howa Type 89 automatic-firing assault rifle
- Date: 2004-12-02
- Location: Nuclear power plant
Terrorists with a single motive to explode the nuclear plant have captured the facility in an effort to contaminate Japan. The JSDF's Special Forces Group, acting on orders by the Japanese National Police Agency, executes this assignment to secure the plant, capture Kifaf Nadhir, and protect Japan from nuclear contamination.
Lethal Enforcers 3
Note: This stage is called "Seigi no Hero" in Japan
- Player character: SAT (Special Assault Team/Tokushu Kyoushuu Butai) operatives
- Suspect: Yoshiki Tokita (鴇田 芳樹 Tokita Yoshiki)
- Munitions: 10-round Glock and all power-ups from the 2004 stages
- Date: January 13, 2005 (The incident started January 11, 2005)
- Location: National Diet Building
- Note: Players can't play this scenario unless the other 5 are completed, given the occurrence year being 2005
A coup d'etat through an act of dissatisfaction against the Japanese government has erupted. A rogue Rikujou Jieitai regiment, the Eighth Imperial Kanto Army, are demanding the prime minister to enact 12 provisions into the Japanese constitution within a certain amount of time. This situation is deduced as a violation of Japan's Article 9. Only a dedicated group of SAT operatives (called "Tokushu Kyoushuu Butai" in this version) can take on Colonel Yoshiki Tokita, and rescue both the Prime Minister and Japan from such act of treason.
- All Japanese hostiles are named after either famous Japanese people or people who worked for the game's developing firm, Polygon Magic.
- The game is spoken entirely in Japanese throughout gameplay (i.e. when players lose a life, the announcer will say "Player junshoku" (殉職) or "Player died on duty") — this was the case in The Keisatsukan and The Keisatsukan 2. The reason is to simulate the players' experience working as a Japanese authority.
- While it may seem that the player would assume that he/she might be fighting amongst him-/herself, given that players play as JGSDF troops in the 5th stage and fight against the Rogue JGSDF troops in the final stage, they are not related to each other, a reason why players don't see the JGSDF troopers during the end credits.