With the Occult Research Club confronted by a very powerful dragon, Níðhöggr, who also has a grudge Ddraig for his involvement in helping Odin sealing him in Niflheim. Despite the dragon outmatching the power of the original Satans due to his consumption of Yggsdrasill, Issei decides to stand up and fight by activating his Cardinal Crimson Promotion, causing the other characters to join as well. With his body covered in armor, Issei charges at Níðhöggr at full speed and prepare to strike. Níðhöggr, however, is unimpressed.
"That's it? I expected more out of you Ddraig." Níðhöggr roars and lets out a powerful soundwave sending Issei flying back and crashing to the ground.
"T-that was very strong." Issei struggles to get up.
"Hang on Ise-san. I will heal you." Asia approaches Issei and uses Twilight Healing on his wounds, despite his injuries only being minor.
[Frontal attacks won't work if you try it directly. Níðhöggr can easily send those attacks right back at you as his power rivals Midgardsormr.]
Ddraig warned as Ophis approaches Issei.
"Ise, like all dragons, Níðhöggr has its strengths and weaknesses. It will be up to you to exploit them."
[Partner, Ophis is telling you to be more observant towards the enemy. If you see a blindspot, it will be where you strike.]
"Understood. Asia, whenever you see a comrade injured, shoot them with a Twilight Healing arrow." Issei then flies off again towards Níðhöggr.
"I will try my best, Ise-san." Asia then heads to the battlefield herself.
Níðhöggr sends a giant fireball from his mouth towards Rossweisse. Luckily, she used a powerful defense spell strong enough to block Balance Breakers. Akeno then uses her Holy Lightning and combines the attack with Rias' Power of Destruction, aiming for the giant dragon. Before the dragon can counter, Serafall froze the entire mountain to restrict Níðhöggr's movements.
"Rias-chan! Akeno-chan! Attack him before he breaks free!" Serafall yelled.
The two released their attack and explodes upon impact, shattering all of the ice made by Serafall as well as part of the mountain. When the smoke clear, however, Níðhöggr comes out with barely a scratch on his skin.
"Not bad, but still weak." The dragon flaps his wings and blows off the three girls.
Níðhöggr was then suddenly hit from behind. When he turns around, he sees Koneko striking him with her fists and upon seeing him eye-to-eye, she attempts to reach his head. Níðhöggr easily blew her off with his roar. Irina's light based weaponry proved useless against the dragon, as she is unable to penetrate his skin, even as she begins using Holy Demonic Swords.
"I expected more of a challenge from the friends of Ddraig, but I guess I can awaken more of his power by killing all of you instead. I am expecting more of a challenge coming from his rage."
Xenovia summons Ex-Durandal and Kiba summons Gram. Despite moving at superhuman speed in an attempt to find Níðhöggr weak spot, the dragon easily sees through their movements and waves his massive tail, clashing both swords, and, surprisingly, breaking them. Unable to react fast enough, Níðhöggr swipes the two with his tail and send them back crashing down on most of the equipments for Oppai Dragon. Seeing the dragon targeting Xenovia and Kiba, Ravel with draws her flame attacks and flies down fast enough to save the two before the dragon crushes them with one of his front legs.
"This is bad. It will be a while before help can arrive and we are struggling so much just to survive." Ravel said in her thoughts.
Issei stumbles upon Gasper hiding in a box. Disappointed that he is the only one, along with Ophis, not fighting, he approaches the frightened vampire.
"Gasper, why aren't you fighting? Can't you see that we desperately need help in holding that dragon off?"
"I wanted to help, but I don't have any power. You were nowhere to be soon so I went looking for you before I began hiding here."
"Well, I am here now. Hurry up and drink, because I still have to fight." Issei withdraws his armor to allow Gasper to drink his blood.
Once Gasper is done consuming, his powers increased to the point of freezing Níðhöggr within his power to stop time using his Sacred Gear, Forbidden Balor View, and begin taking advantage as he moves in high speed with Issei following him.
"Let's take him down together!" Gasper said.
Issei nodded in response and begins gathering magic in his left hand until it was a size of a tennis ball.
"DRAGON SHOT!" Issei releases the ball of energy and turns it into a large beam aiming at the dragon.
Another large explosion ensues as the rest of the group moves away to avoid the blast. Again, the dragon escaped with very minor injuries, but more so than with Akeno's and Rias' combined attack.
"Now this is a fight." Níðhöggr commented as he waves off the smoke.
"This was one of my most powerful shots. What can really damage this dragon?" Issei asked.
Níðhöggr attacks Issei with another giant energy blast, but Rossweisse came just in time to protect him.
"Ise-kun, you better find a weakness soon. At this rate, all of us will be killed trying to defend you since you are the only one right now who has a chance of beating Níðhöggr."
The dragon then waves off Rossweisse with his huge hand. Before Níðhöggr is able to grab Issei, Serafall attacks the dragon's hand with her own demonic powers. Serafall then battles Níðhöggr briefly on her own as she attempts to match his power with her own.
"As expected from one of the current Maous, you are powerful, but foolish if you think you can beat me."
Both Serafall and Níðhöggr release their blasts of energy at the same time and collided. This does not look good for Serafall as her attack is slowly being pushed back by the dragon's attack.
"We better help Serafall-sama." Rias said as she starts using the Power of Destruction again.
Issei continues shooting Dragon Shot with barely any effect, as he is weaker from his last use. Rias and Akeno are also facing similar problems as the battle has taken a lot out of them, although Rossweisse continues her bombardment. Gasper tries to use his time stopping ability to slow down Níðhöggr's attack, but the immense energy released from the blast prevents it from being pushed back. Kiba and Xenovia summons new swords in an attempt to penetrate Níðhöggr's gigantic wings and were partially successful in distracting the dragon briefly, despite the swords not causing any pain. Seeing Níðhöggr distracted, Serafall let's go of the attack to move out of the way, avoiding the dragon's attack. Seeing her opportunity, Koneko uses Senjutsu in an attempt to cut off the dragon's ki, but Níðhöggr reacts fast enough to blow her away with his roar. Desperate, Koneko uses her Senjutsu to form a ball of energy in her hands and releases it to form a distraction to cover her escape. Angered by these desperate attacks, Níðhöggr opens his mouth and begins forming a massive ball of energy greater than Issei's Dragon Shot, Rias' Power of Destruction, and Akeno's Holy Lightning combined.
"Enough of these games! I am going to kill all of you right here and now!" Níðhöggr releases the attack.
Everybody moved out of the way and avoided a direct collision with the attack, but as soon as it collided with the ground, the entire mountainous is soon filled with explosion so big that it Devils and Fallen Angels could witness the attack from a town many miles away. In the aftermath, the entire area became a wasteland with almost everything has been destroyed. Because all of the Occult Research Club avoided the direct collision, they escaped death, but most are unconscious except for Ophis (who is still in hiding behind some rocks), Rias, Issei, and Serafall.
"It seems as if you are out of ammo to hit me with. I still have mine." Níðhöggr prepares another attack.
In response, Issei turns to Rias. "Buchou, let me touch your Oppai! I have to stop the dragon!"
Seeing Issei being very serious, Rias quickly, but reluctantly agrees. As soon as he touches her breasts, energy begins gathering on Issei's left hand, giving him a nosebleed, but quickly got over it.
"This is it! My last Dragon Shot!"
"Ise-kun! I will combine my powers with your attack!" Serafall gathers energy to her hand and aims at Níðhöggr.
"DRAGON SHOT!" Issei yells again as he releases his attack with Serafall releasing hers' and combining it with Dragon Shot.
"No way the same attacks will work on me again." Níðhöggr finishes gathering energy for another attack, but this time uses it to cancel Issei and Serafall's attack, much to the horror of the three.
"I will admit, that attack would have injured me greatly if I hadn't blocked it. Too bad that you can only use it once."
Issei put the two girls behind him for protection as he intends to take the attack head on.
"Ise, what are you doing?" Rias becomes very scared.
"I know that I have already died once, but if Buchou were to die, then I would regret this even more."
"But I've heard you died once. If you die this time, you might not be able to come back again." Serafall also begins to get scared.
"Sorry Leviathan-sama, but Níðhöggr is only after me. At least this way, the two of you can live." Issei then flies towards the giant dragon.
Serafall and Rias attempt to stop him, but Issei pushes them away. "Please don't. If I see you two get killed Iwill feel even worse than when I was dead so please go back."
Both girls tearfully obeyed as Issei turns to Níðhöggr. "If it's me you want, here I am. Just leave my friends alone."
"If you would allow me to kill you then I accept your request. Prepare yourself."
As Issei braces for Níðhöggr's next attack, the dragon's body suddenly stopped in its tracks.
"What? What is this?"
Issei looks around to see Ophis pointing her finger up towards Níðhöggr. Serafall and Rias also watched with shock.
"I may have been weakened due to Samuel's Curse, but I am still twice as strong as Ddraig."
Ophis then turns to Issei. "Sorry it took so long, but I needed more time to gather my power since I cannot control them the same way I am used to."
"It's okay Ophis. You saved us so we are thankful for that." Issei said.
"Ophis? The Dragon God is this little girl?" Níðhöggr stares at Ophis with anxiety as he struggles.
"Ise, Serafall, I have him restrained. It is up to you to finish him."
"Do you still have some energy left, Ise-kun?" Serafall asked.
"Only a little since Níðhöggr stopped my attack. Because I didn't release all of it, I was able to get back a small amount as a result."
"It's good enough. Let's finish this together Ise-kun." Serafall flies on top of the defenseless dragon and gathers her energy one more time as Issei does the same.
Not wanting to be outshined, Rias begins using the Power of Destruction, intending to combine the attacks as well.
"Wait! If you combine your attacks like that, it might kill me!" Níðhöggr begins begging for them to stop.
"Don't worry, this won't be enough to kill you." Issei told Níðhöggr.
"FIRE!" Issei screamed.
The three then release their attacks and combined them as they target Níðhöggr. Unable to cancel the attack, the dragon took it head on creating another large explosion, this time on par with the power that destroyed the entire area. As Issei promised, the attack didn't kill Níðhöggr, but instead renders him unconscious. After the battle, a magic circle forms with Odin coming out of it.
"I've heard about what happened with Níðhöggr. I am sorry that all of this happened, because of Loki. I should have known that he would have used his magic to unlock the dragon's seal. I will have him put under tighter security this time so only I can open it. Again, my apologies."
"It's okay Geezer. I am just glad we were able to stop him before he can continue his rampage." Issei told Odin.
"It's amazing that all of you were able to stop Níðhöggr despite being outmatched. I really have to keep an eye on all of you. See you until then."
Another magic circle activates as Odin's body disappears along with Níðhöggr. In the sky, Oppai Dragon's new director and several of his crew were seen filming all of this.
"Wahoo! That is some great footage we got there and this is even better than my previous! Good job everyone!"
"You mean you were here all this time! What happened to calling for help while we were fighting? We almost got killed and this entire area has turned into a gigantic wasteland!" Issei screamed out of frustration.
"How do you think Odin knew about this? It is because I was the one who told him about this situation. After that, there were so many intense moments; I had to get this all on film. I can see it now, Miracle Levia-tan and Oppai Dragon crossover movie. The two heroes, and even the villain, Darkness Knight Fang, forced to work together with Oppai Dragon's allies to stop an even greater threat from destroying the Underworld. I can't wait to see how this will turn out."
The director gets even more excited as he retreats back to the studio to edit the footage, much to Issei and Rias' dismay, though Serafall seems more optimistic about it.
"I cannot wait to see how the movie will turn out." Serafall makes a bright smile.
"I am glad you are living with us Leviathan-sama. You spend way too much time playing your part." Issei pats Serafall on the head, much to her delight.
"Ise-kun, you really got me and Rias-chan scared to death when you intended to get yourself killed to save us. I thank you for that, but please don't scare us like that anymore. I will feel sad if you had died.
"Sorry Leviathan-sama, but I would have felt the same way if you and Buchou had died. Please forgive me."
"I will forgive you after you do one more thing for me. Please don't call me Leviathan-sama anymore. We are family so can you call me something else?"
"I can't call you Levi-tan since it would feel like talking to an unreal character, but how about Levi-chan?"
Serafall again makes a bright smile. "That sounds good to me."
"If you two are done talking, we better help clean this and report the situation to the three factions." Rias suggested as she, Issei, and Serafall gather all of their unconscious friends and transport them from the area to a hospital.
Within a couple of days, the report of Níðhöggr's attack has spread across both Heaven and the Underworld. Sirzechs, Grayfia, Lord Gremory, and even Lord Phenex came to the Hyoudou Residence as promised, but it is also to discuss what happened during the battle.
"I heard that all of you have stopped Níðhöggr from continuing his rampage so I thank you for that, but why didn't any of you alert us?" Lord Gremory asked.
"We didn't have time to. When Níðhöggr appeared, he attacked us almost immediately so we couldn't call for help." Rias answered.
"It was also very admirable for Serafall to assist in the battle, but you know that you could barely match the dragon yourself and yet you attempted to face him alone at one point. Then again, I can't stay mad since all of you were able to stop Níðhöggr. I got to remember to promote the director for alerting Odin-sama about the situation." Sirzechs gets distracted as he makes a call to the director.
"Can't believe Odin-sama came again yet I was unconscious." Rossweisse begins showing frustration as she drinks her tea.
"You better not get involve in situations you or the entire household cannot handle. Call us first if you face trouble like that again, understand?" Grayfia warned Rias.
"Yes, Onee-sama." Rias said frightened.
"Ravel, you aren't hurt are you from the battle?" Lord Phenex asked out of anxiety as he hugs her daughter out of relief.
Ravel's face becomes red as she struggles. "I am fine Otou-sama. A Phenex can't be killed that easily so please let go of me. You are embarrassing me in front of Ise-sama."
"Well then, rather than staying angry, shouldn't we celebrate now that another incident is over thanks to them?" Sirzechs suggested.
It wouldn't be long before another party starts in the Hyoudou Residence and again, much to the dismay of Rias due to her brother's childish attitude.
The next day, the Student Council confronts the Occult Research Club again regarding the Níðhöggr incident. Much to Serafall's surprise, Sona gives her a big hug out of relief.
"I am glad that you are alive Onee-sama. You should have told me about this."
"I am sorry Sona-chan. There wasn't any time to call. I am very lucky that I wasn't fighting alone." Serafall turns to Rias and Issei, causing Sona to do the same.
"Hyoudou-kun, I heard that you were willing to risk your life to protect Rias and Onee-sama. I am grateful for that. Thank you."
"You are welcome Kaichou. I am just glad that this is over."
"I am also happy that Ise-kun works hard for my sake." Serafall immediately rushes to Issei and gives him a big hug.
"Serafall-sama, what are you doing? Let go of Ise!" Rias attempts to separate Serafall from Issei, but to no avail.
"Sorry Rias-chan, but next to Sona-chan, Ise-kun is the most important person to me." Serafall hugs Issei even tighter in response, with the rest of the girls from the Occult Research club watching with jealousy with the exception of Rossweisse and Ophis.
Sona and Saji, however, reacts differently to the situation.
Sona becomes flustered seeing her older sister making a scene in front of others. "I wish that Onee-sama would grow up a little more."
"Curse you Hyoudou. Why does everything good have to happen to you?" Saji turn around as he begins to sob, much to Sona's dismay.
The movie featuring the crossover of Miracle Levia-tan and Oppai Dragon has finally been released. Ophis' involvement has been absent due to the director mainly focusing on Serafall, Rias, and Issei, but nobody cared since Ophis' existence is kept secret though Serafall now knows about Ophis' identity. After the movie was over, the audience gave a huge applause to the casts as they bow down, with some saying that it was better than the last film "Magical Levia-tan: Attack of the Danball Vampire God!" since the movie was made while everyone was being serious.
[GASHAN GASHAN]
As soon as Issei heard the sound of metal clanging each other, he makes a run out of the theater as soon as everyone was let out, knowing that female armored monsters were watching him, intending to give him a hug.
"I am not going through that again." Issei told everyone as soon as they catch up to him.
Back in the Hyoudou Residence, Issei is watching TV when Serafall suddenly comes in and sits next to him.
"Ise-kun, can you tell me how you got the Ouroboros Dragon living with you?"
"It is something that has to be kept secret from the three factions due to her history. I can't tell you even if I wanted to due to risk of exposure."
"I can promise to keep it a secret. After all, if I didn't know, I might accidentally reveal Ophis-chan's name without knowing."
"I suppose you are right since you are living here, but please promise to keep it a secret, okay?"
"Of course."
Just like that, Issei begins telling his story about his encounter with Ophis. Serafall's fascination grew as she listens to his story with the rest of the Hyoudou Residence preoccupied with their own affairs. The mountainous region that was destroyed by Níðhöggr is slowly being repaired as the Underworld is now experiencing a period of peace once again thanks to everyone in the Hyoudou Residence.
Hope you readers enjoyed this chapter. I wanted to make the battle scene longer, but I don't know how to make good battle scenes so that is probably the weakest point in the story. This chapter was fun though and more will come eventually.