Viper's Creed

AGS Blademen were deployed to pursue a Megasoma Bugmech en route to Daiva City. The Megasoma puts up a tough offensive against the AQS Maneuver-Blades, nearly forcing the army to intervene after the Blademen had sustained casualties to eliminate the armed Bugmech. One of the Blademan operatives, Saiki Cryde, decides to sacrifice his Manuever-Blade by self-destructing it in order to blow up the Megamsoma taking a section of a highway along with it. In the end, Saiki was forced to give up most of his pay for the highway's repairs despite being able to eliminate the threat.

Haruki Oguma, the only son of AGS President Fuyuhiko Oguma, is selected to be an AQS Blademan operative despite his father's wishes for him not do so in order to prove that he can protect Fort Daiva City and its people by himself and not by his father's influence. His presence brings some doubt to the other veteran Blademen, including Saiki, due to his ties with the company's president. During an AGS operation to hunt down Gellis Bugmechs, Haruki receives orders to immediately withdraw. Despite this, he disobeys them and hunts down the Gellis with Saiki accompanying the young Blademan as they were able to defeat squads of Gellises on their own.

Saiki gets blamed for the killing of a local man after he had fired on the Blademan in an anti-Bugmech operation that resulted in civilian casualties. In the course of hiding from the police, Saiki is given shelter by an old friend, from his war days, named Doc while Kariya tries to obtain information covertly on the culprit responsible for framing him. During her investigation, she finds out that one of their own could have been the real shooter in the death of the homeless man and framed Saiki in his place. She enlists the assistance of Haruki to help her locate the culprit while Norma and Rudra are on the scene to capture the culprit for monetary gains.

After a young elementary school student was kidnapped from a monorail by an unknown man, Norma works alone to provide ransom money to save her from her captors. However, the car used to transport her was planted with a Ticker bomb by an Acromantis Bugmech. When Norma was wounded by a gunman in the outskirts of Daiva City, she reveals to Kariya and Saiki that the girl's name was Marie and she was her only daughter during their time together as homeless refugees after escaping from war before she gave her up to adoption due to lack of necessities needed to provide care for her and was recruited as a Blademan operative in order to ensure that Norma can provide it to her daughter.

Police arrest Rudra for being the main suspect responsible for the assassination of a public official by using a sniper rifle-armed Maneuver-Blade mecha despite him being present with the other AGS personnel during an anti-terrorist operation. Being released from police custody with the intervention of AGS officials, the blonde man has surmised that the main culprit responsible for the attack before his detention on the official was someone from his past. He finds out that Maya, an ex-war buddy of his from his World War III days as an anti-government guerrilla after an attempt was announced on President Oguma.

When Haruki invites Saiki, Kariya and Gharib to eat with him in a local Asian ethnic restaurant for dinner, the four AGS personnel find out that the owner is subjected to a huge debt. However, Gharib finds out that the one sent to collect the debt on the restaurant was an ex-soldier who had trained under him during Gharib's day as a military officer when the soldier's hands were disabled after the bald man saved his life by shooting the armed landmine. Determined to save the restaurant and do something about his life once more, Gharib decides to help the owner's daughter to move on from the past and assist her in her cooking skills.