OMS is the story of  Hinku , an Ogrebots mechanic, as he tries to retake the control of the Supreme Mechanics Assignment (SMA), an organization tasks with the protection and provision of outposts across the Matelium World.

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In his pursuit to inherit his grandfather post as the leader of SMA, with his childhood friend  Iitchyo an Ogrebot Mechanic himself, both trained by the late father of Hinku.

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In their travels they meet  Zisan  the daughter of SMA leading researcher, killed by  Numiya  the wife of Kuruki the current leader of SMA after a violent overtake, in a jealousy driven attack.

 

Together they free outposts from the oppression of SMA allocated Ogrebots Mechanics, as they provoke  Kuruki  and his son  Osku  to battle once and for all, for the leadership of SMA

In their Adventures they meet the locals of Matelium outpost, some more peculiar with magic spells knowledge that they reward the traveling trio to aid them on their journey.

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But Kuruki want to stop their progress of uniting the Matelium outposts for revolt by reinforcing the outpost still under the SMA control with even more powerful Ogrebots Mechanics to stop them at their tracks without jeopardizing all in his power in one last showdown, he would rather see his son or wife in battle before such day.