(CHEMYxSTORY - Back-On x FLOW)
(English translated )
(Source: Fandom)

Yeah-e-e-e-eh

(Each protagonist shows their half faces on the cams each second; Kiana's good and evil, Raiden's cheerfulness hiding the struggles, Bronya's rogue attitude glitching the neutral, Eula's sense of justice towards her family, and Y/n's smile and coldness. Finally showing the glowed-up Gundams of Celestial Beings)

Yeah-e-e-e-eh

(Then metal platings, GN Particles, and Honkai energy merged to form the title of the book, and the background is the day and night cycle.)

MUSICAL

(It shows the Gundams launching out of Ptolemy's catapult and Hyperion Valkyries jumping from the ship's landing platform as they follow the Gundams before everything disappears into the bright sunlight.)

Forget about Rankings and thinking about it logically
They can never fully convey our Friendship!

(The Valkyrie trio is in the classroom with Raiden and Bronya patting Kiana's head because of her temper against Fu Hua who just simply adjusts her glasses. Then it shows the girls on the battlefield tearing through Honkai Beasts while Welt, Siegfried, and another person are observing from the top of the building.)

No time for pitying, the key's to keep dreaming

(Then it shows Eula and Yuna are in the Hyperion's hangar fixing Eula's Gundam battlesuit. Yuna looked at her watch alarming that she had a mission on Celestial Being.)

Just respect and help each other out,

(Y/n prepping his gear as the Celestial Being of the era has joined up with him.)

Only then can we reach a world full of love!

(Then it showed the colorful gems on Setsuna's hand which he is smiling like he cared and are precious to him but he was suddenly pulled and was shocked as he vanished by dark shroud mists covered him and the gems fell from his hands into the deep dark void as a black hand stoles them.)

In this maze with no exit
If you break through, then Use your imagination!

(It showed Kiana as a Valkyrie Ranger shooting every Honkai zombie, Raiden Mei slashes the zombies and mechs with her sword, and Bronya fires her beams with her Project Bunny towards the camera.) 

Always in a flash, the Changemaker
Taking over empty space with Art!

(Then shows Schicksal Valkyries and the Immortal Blades on a golden cube and from outside it was held by Otto. Then, all of the Gundam Meisters namely Lin, Rin, Sakura, Kallen, Eula, and Y/n faces the camera and shouted as one.)

ALL Gundam Meisters: HENSHIN!

You ready?

The way we understand each other is like CHEMY×STORY
It's what makes us invincible!

(They transformed and it shows the Hyperion team suit up in their battlesuits while engaging the Honkai enemies. Then shows the Gundams launched out of Ptolemy's and Hyperion's catapults fighting alongside them.)

Gotcha! Gotcha! You're never alone
You got friends who will share the burden!

( They have each other's backs like Himeko and Kiana, Mei and Astray Blue, Kyrios and Bronya, Theresa and Exia Repair IV, and finally Exia and Star Build Strike. A new event shows the past of the great 2nd Eruption.)

This emotional Power might be a Mystery,
But it helps us blast off to the sky towards the Universe!

(It shows the shadows of Herrschers of Wind and Void battling Y/n in his Exia all alone. As two Herrschers unleashed their attacks towards him, he tanks the blow but at the cost of his battle mask cracked revealing the right side of his face.)

Gotcha! Gotcha! Let's break the Limit
And our wishes will keep on Growing Up!

(He then shouted as he transformed into Exia's descendant, 00 Raiser, and clashed once again with both of his GN Swords before the whole place became enshrouded in a bright flash of light.)

Yeah-e-e-e-eh

(Shows the Exia's head unit, dirty and battle-scarred.)

Gotcha & Go

(Then shows Y/n's friends and family in Sumeragi and GUND-Arm Inc.)

Yeah-e-e-e-eh

(Then the trio alongside raised their heads high and looks at the light glittering it's GN Particles.)

This is my and your CHEMY×STORY!

(They ran towards the bright light reaching out the bright 00 Raiser.)

A/n: And the Kamen Rider Gotchard opening is the winner. This opening will be here until HI3 Game Chapter 9 where we get to his duel of fates and his "fateful demise".