Since Ryuga couldn't convince them with the word, he beats the Heroes party. But even after showing his power, they still refuse to accept the truth. He distanced himself to Hero party to let them finish their preparation. He doesn't want them will make an excuse when they lose later.
Aoi immediately healing her party with [Heal], even though they didn't have any wounds. They only have few bruises because Ryuga was holding back. They begin to cautious around Ryuga and they use their best formation. Aoi and Jennifer as the main attacker, Ryuji on the behind to cover Amanda, while Amanda will support Aoi and Jennifer.
Ryuga thinks this party could survive because their survival chance is slightly increased. Their formation is very good. but Ryuga already figures out their strategy. So he decides to play along with them and doesn't want to ruin their plan. He will push them to their limit since they are Earthling like him, so he will give them a few lessons.
The Heroes Party already finish their preparation and begins to move first. Jennifer using her Gift [Hercules Strength] from the start to make Ryuga busy and can't move his vision from her.
"I will make you regret being born!!!!
"I don't born in this world though.", Ryuga retorts her with nonchalantly.
Jennifer attacks him with her sword and dagger to maximize her ability. Each strike is very strong until Ryuga lost his footing due to the ground was cracked because Ryuga blocks her attack. Her attack very fast and aim Ryuga perfectly, without unnecessary movement. Jennifer swiftly swings her weapons as if she was dancing elegantly. Every time her weapon meet with Ryuga's sword, it will make a powerful gust to their surrounding. Their battle is very fierce and loud crashing noises echoing like a thunderclap.
Ryuga calmly using his sword to parry her attack, with his powerful suits he able to block Jennifer's monstrous strength. He can predict where her sword will aim, and he will defend that immediately without the assist from his AI. Since they are Heroes, Ryuga can't reveal his card carelessly in front of them.
Aoi immediately following Jennifer and switch their place, because Jennifer is tired after using [Hercules Strength] for a long time, so she needs to retreat for a moment before continuing her attack. This is their strategy when they facing a strong monster before and it never failed. While Aoi crossing her sword with Ryuga, she asking his purpose.
"Why do reveal your identity to us? Normally you wouldn't make contact with Hero if you a Demon Lord isn't it?
"I just want to show the truth to you guys."
"But what is your proof?!!", Aoi is irritated because Ryuga killing Alicia before. If he was a fellow Earthlings, he won't kill the innocent girl like Alicia.
"I already speak Japanese to you, what can I do for proving my word?"
"IF you are a Japanese, you won't kill that girl!!!!"
"That's because she was the one who summoning me here."
"Ehh?!!"
Aoi showing an opening and Ryuga kick her stomach and make her flying several meters. Ryuga is treating women roughly and that's was different from his gentle side on Earth. Spending the day with Alicia could change him so much. But at least, he still able to hold back before killing Aoi.
"Aoi....!!!!"
"You bastard!!!!"
Jennifer attacking him again but she swallowing by madness and her move become easy to read. Ryuga defends her attack as a child play and planning to make Jennifer tired. When Jennifer showing an opening to catch her breath, Ryuga tried to attack her. But before he can do it, Jennifer leaping to the right side and make Ryuga clearly exposed to Amanda's attack. A powerful arrow come to him with speed faster than the sound and make him using his Nano-Shield to block this attack
"Yes, a direct hit!!!!" He will die for sure!!!", Ryuji is overjoyed because this is a big achievement for him as a Hero
"Finally we win against one Demon Lord!!" , Jennifer also glad that she wins against strong opponents
"Guys, I have bad news. My attack doesn't kill him", but Amanda word brings them back from delusion.
As Amanda said, Ryuga is completely unscathed. This fact makes the Heroes party become lose their hope. But Aoi never lets that happen, she volunteers herself to attack Ryuga while he still recovering from Amanda's attack. The truth is Aoi is slightly interested in Ryuga because of his unique demeanor. She never imagines a human like him boldly confess that he is Demon Lord in front of Hero.
"Haaaahh.....!!", Aoi swings her sword to Ryuga and Ryuga defends her attack easily. She needs to buy time for her friend to recover from the shock and restore their spirit.
"What is your purpose huh?! Are you trying to deceive us?! You are so strong and you can kill us if you want, but why you don't do it?! We are your enemy and yet you kill innocent girl?!!!! Are you enjoying killing innocent people huh?!!!" , A barrage of question come from Aoi to Ryuga.
More than questioning him, Aoi is probably venting her stress to him. Ryuga doesn't need to hide his intention to get back on Earth so he will tell her.
"I want to return to Japan because I have a family waiting for me."
"Family?"
"You think I will happy if I was separated from my family?"
"But why you kill that girl?"
"She is the goddess who summoning me."
"Enough with nonsense. It's impossible a Goddess can be killed easily like that."
"You probably don't believe me and I won't force you to believe me. But what I want to you know that you're just entertainment for the Goddess. Don't believe her nonsense since I know her better than you. I don't know how you summoned here, but let me tell you something. There are a lot of Earthlings in Laverio, and some of them are Demon Lord to like me."
"Are you serious?", Aoi is slightly doubted his story, but IF Ryuga really wants to find the way to return to Japan, she can put her hope to him.
"Don't think all Demon Lord is kind like me. They maybe have few screws loose inside their heads,so be careful."
Ryuga and Aoi clashing for a long time, but in Ryuji's perspective, they were dancing elegantly with their sword. Aoi's attack is not so strong, while Ryuga only playing around with her. They seem to have a conversation, but Ryuji can't hear them. Jennifer comes to assist Aoi and cut their conversation. Ryuga already knows that Aoi is the only one who can listen to his story.
"I am sorry for letting you hold him alone Aoi-chan."
"No problem Jennifer."
They begin to attack Ryuga form both sides and try to make Ryuga can't defend the next attack from Amanda. Ryuga doesn't let that happen and materialized a big shield to knock Jennifer and Aoi. While he using the shield to knocking them, that shield can be used to block Amanda's attack. This the best solution for him. Aoi and Jennifer bounce off several meters due to the impact. They already tired and they need to finish this battle in a short time before they completely are worn out.
Ryuji runs toward Ryuga using his shield as protection from any attack that might come to him. At first glance, Ryuji seems reckless because he comes directly to him only using shields. But the truth Amanda running behind Ryuji and conceal her body perfectly from Ryuga's vision. Ryuga can hear the step clearly with his ears and found something odd. Ryuga realizes that Ryuji becomes decoy and the real attack will come from behind him.
"[Diamond Will] {Oh light spirits, listen to my command and bind my enemy} [Light Binding]!!"
Ryuji cast [Diamond Will] to make his body and shield become as hard as a diamond rock and [Light Binding] to hold Ryuga on his position.
Several light vines appear and binding Ryuga's feet. He can break this vine if he wants but Ryuga wants to see their trick first. Ryuji uses his shield to knock Ryuga, but Ryuga also using the same trick with him and they collided with each other.
"Now!!!"
"Haaaaahhhh...!!!!"
Behind Ryuji, Amanda appears while holding her longbows and ready to shot her arrow. Ryuji desperately holding Ryuga's shield to prevent him from using that for blocking Amanda's attack. Ryuji thinks that Ryuga can't summon another weapon if he still holding a weapon. But he was wrong.
Ryuga discards the shield and kicks Ryuji's shield without holding back. Ryuji was blown away and his shield was broken because of Ryuga's kick. Amanda releases the arrow and aiming to Ryuga's chest but Ryuga catches the arrow like it was nothing. He breaks the arrow while approaching Amanda since she was the last one remaining.
But then several pillars of lights flying to Ryuga. He immediately retreats a few steps from his position before. He found that Aoi attacking him.
"Run Amanda!!!"
Amanda using this chance to run away but Ryuga wants to make her pass out, because of her attack is annoying. Once again several light vines appear and holding his feet. Since this will become an endless loop, Ryuga uses his Nano-Cable to catch Amanda.
"Eh?!!!"
"No...Amanda!!!!!"
Ryuga catches her easily and pulls her toward him. Amanda doesn't give up yet and uses her hidden dagger to prepare the last attack on Ryuga. When Ryuga almost holding Amanda, she tried to stab him with the dagger but Ryuga able to dodge her attack and take her wrist and smash her to the ground then she passed out instantly.
"Amanda!!!!!"
The remaining party member comes to attack him at once. Ryuga using the least amount of movement possible to dodge their attack.Ryuga using a roundhouse kick and hit Jennifer's stomach. She has thrown off several meters and lost consciousness.
Ryuji becomes furious, his eyes bulged and his pupil burning with madness. Brimming with hatred and bloodlust, he charged at Ryuga once again, but he forgot that his shield was destroyed, so he didn't have a weapon. Since he doesn't learn about martial arts, his act is similar to suicide. Ryuga mercilessly slaps Ryuji to wake him from his delusion. Just his slap is enough to make Ryuji collapse like a broken doll.
"What will you do to me?", Aoi retreats slowly to avoid being caught.
"I won't do anything to you since you want to listen to my story. I will spare you guys for now. But please remember my word, rather than having a pointless fight you should think how to return to Earth."
Ryuga also considering that Aoi can use Healing ability, so she would able to heal her party. Ryuga turns his back to leave this place.
"Then what IF the condition to killing all heroes in this world? Would you kill us, the Earthlings too?"
Ryuga stopped for a moment and facing Aoi once again before answer her question.
"If that was the condition, I will kill the God who makes that crazy rules. In this world, there are 108 Demon Lords, so can you imagine how many heroes that I must kill?
"You just talking like you already killed a God before."
"I killed one right in front of your eyes. She is Goddess Alicia. Rather than sacrificing countless Earthlings to return on Earth, I would rather kill the God who summons me in the first place. Since the Goddess already dead, I don't need to worry about another Hero will come in the future. Aoi, I will trust you to convince other Heroes that they should find the way to back on Earth, while I will try my best to search a clue on Demon Race."
"But..I...I..."
"Even I say that I don't want to fight with the same fellows from Earth, that doesn't mean I will let them kill me.IF other Heroes come with the intention of killing me, I will show no mercy. Goodbye Aoi."
Ryuga activated [Stealth] mode once again and flying back to Gobstar's territory.