Here's a really rough translation of the rest. I wrote bubbles 1-3 of the "after battle" text in past tense, because the events already happened, but the Japanese version has them in present tense.
Having seen the light, Heisengard took his first step into Yukulena as a hero.
3rd text bubble
Starting from "Ronwall Saga Prologue"
The game loads to a battle. There is a party of 5 on one side and one dark looking guy standing at what looks to be a throne.
The next lines are a conversation that takes place as they trade blows. The first line of a pair is the person the second is what the person says. One of the 5 dosn't talk.
ハイゼンガルド Seemingly the leader of the 5
Heisengard: "Prepare yourself, Demon King Baltgeist!"
魔王 Seemingly the bad guy
Demon King: "You dare to come here... You are just a human, aren't you?!"
Inimu: "Heheh! He was given a proclamation from god. Does that sound like 'just a human' to you?"
Balrou: "That's absolutely right!"
Feimea: "You, who are an enemy of god, must now recognize him as a worthy opponent!"
(Not sure about this line.)
Demon King: "Very well! You who call me Demon King! I shall never be defeated by the likes of you! Have at you!"
Demon King: "Pathetic!"
Demon King: "I-It can't be... I've been defeated by these puny humans!"
Feimea: "...Strike the last blow!"
Heisengard: "Right!! This ends now!!"
Demon King: "Arrgh! T-this power?! I-is this god's proclamation...? Ack!"
"C-could you be...?"
The battle ends.
The game goes back to an aerial view of the world and then four text bubbles.
This was Heisengard, the champion who lead his comrades and triumphed
over the Demon Realm. Accompanied by his four comrades, he defeated
the Demon King in his castle, thus uniting the Demon Realm and the Human
These five champions became hero kings who ruled over Ronwall.
From this point on, peace and harmony came to Ronwall.
Starting from "Ronwall Saga Epilogue"
And so, over 10 years have passed since the fall of the Demon King's castle...