Young Kengo Manaka lives on Mars. As he lives out his peaceful, day-to-day life, the monster Golba suddenly appears, throwing the town into chaos! Meanwhile, Kengo has a fateful meeting with a giant stone statue sleeping deep beneath the ground on Mars. When Kengo becomes one with an Ultra-Ancient light, his destiny is forcefully thrown into motion!

After Kengo comes to Earth to become a member of the defense team GUTS-Select and protect people from monsters, the Vampire Monster Gymaira appears! To make matters worse, the second Giant of Darkness, Darrgon, has been resurrected! In the face of such overwhelming strength, Trigger has no choice but to increase his own strength too – and that's when a new power awakens !!

A man named Ignis, who calls himself the No.1 treasure hunter in the universe, is going after Yuna! What on Earth could he possibly want with her!? At the same time, Gazort appears cloaked in dark clouds and engages GUTS-Select in a fierce battle! If this continues, they’ll all be taken out in one fell swoop! Kengo!!

The Giants of Darkness begin their fierce attack! Calmaerra drives Trigger into a corner and uses a spell to engulf him in darkness. Kengo resists with all his might, but then! A rift in space-time appears, and Kengo is flung back to the past. Now he finds himself 30 billion years prior in an ultra-ancient era?!

The truth I discover as I face the dark Trigger... It's an Ultra-Ancient memory hounded by destiny. When Yuzare's wish sparks a miracle of light across the ages, the greatest Trigger awakens!

Darrgon is finally able to understand the true strength of humanity. Yet even with his new understanding, Carmeara’s darkness continues to eat away at him. Darrgon! Stop!! Despite how special she is to him; he even tries to hurt Yuna. Do Kengo and Akito stand a chance to stop him now?!

Carmeara finally gets a hold of the Eternity Core and is transformed into the repulsive form of the Evil God, Megalothor! Then, the dark energy she emits begins to engulf the world… at this rate the Earth is doomed! To save the world from imminent darkness, Kengo and the crew’s decisive battle begins!

The Eternity Core is out of control. Moment by moment the Earth nears annihilation, and the most sinister evil enemy Megalothor stands in the way of its salvation. But no matter the cost… faced with impossible odds, Kengo and the crew will never give up! To make everyone smile. For a future where that becomes reality!