Using massive piloted robots to combat the alien threat, earth's survivors take the fight to the invading alien force lurking in the depths of the Pacific Ocean. Nearly defenseless in the face of the relentless enemy, the forces of mankind have no choice but to turn to two unlikely heroes who now stand as earth's final hope against the mounting apocalypse.

It has been ten years since The Battle of the Breach and the oceans are still, but restless. Vindicated by the victory at the Breach, the Jaeger program has evolved into the most powerful global defense force in human history. The PPDC now calls upon the best and brightest to rise up and become the next generation of heroes when the Kaiju threat returns.

从前有位“光之巨人”，他负责保卫世界和平，对抗巨型怪物和外星人入侵的威胁。他就是机动奥特曼。他曾在执行任务时与科学考察队员早田进建立起联系，并在使命完成后离开了地球。时至今日，人类已进入了繁荣时代，但这只不过是和平的假象...现在，世界再次需要“光之巨人”的力量。就在这时，一个新的英雄出现了，他继承了光的基因。但是他并不高大，是一名中等身材、多愁善感的高中生，穿着金属动力制服。他的名字叫早田进次郎，是初代机动奥特曼早田进的儿子。早田进次郎克服种种困难成为新一代机动奥特曼，一个新的故事就此展开。