12 years prior, Tregear incapacitated the New Generation Heroes after misleading them to a minefield asteroid. Inheriting their powers, the Tri-Squad attempted to continue the battle but it leads to their particles scattered in outer space. Taiga’s particle of light merged with a young boy named Hiroyuki to save him from a fall after his Guesra companion “Chibisuke” was kidnapped.
外星人偷偷移居至地球。这件事只有少数人知道，一般的大众仍旧未知。
在这样的社会之中，主角《工藤ヒロユキ》，就职于包含外星人所引发的事件为业务内容的民间警备组织《Ｅ.Ｇ.Ｉ.Ｓ.》日以继夜地为和平工作著。
他却有个连他本人都不知道的大秘密沉睡着。那就是他的体内寄宿著奥特曼TAIGA的光之粒子。
当ヒロユキ体内的奥特曼TAIGA苏醒的那刻，新的故事即将开始！
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