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.
ユニット・ヴァイパーに新兵ハルキが配属された。
彼はアルコンの支社長の御曹司であり、その事実は噂として社内を駆け巡った。
なぜヴァイパーに配属されたのか？
ある日、ヴァイパーはパイプラインにバグメック（無人破壊兵器）の発見、掃討に向かうが、
発見できずにヴァイパーに帰還命令が下る。
しかし、疑念が消えないハルキは一人パイプラインの最下層へと向かおうとする。
だが、向かったのはハルキ一人ではなかった。
サイキもまたハルキの後に続いて――！
Embora seu pai desaprove, Haruki Oguma, o único filho do presidente da Arqon Global, é escolhido para ser um blademan.
