I don't own Highschool DxD, all credits to its creators.
"The little sister of the despicable and fake great devil. I am the true descendant of the great devil beelzebub, Shalba." The man now known as Shalba said.
"Red, can you hear me?" Issei asked through a mental link.
"Yes. How's it going?" The dragon asked in his head.
"It's going very bad unfortunately, this stupid devil transported Asia to the dimenisonal gap where she could die." Issei said.
"I see, well I'll go get her, see ya then Issei!" Great red said in his head.
"Alright see you then!" Issei said as he cut off the mental link. "Rias, everyone." Issei said.
"Yes Issei?" The infuriated Rias asked.
"Asia will be fine thanks to what I just did a second ago. However the same will not be said for this trash in front of us, so I want you all to leave the building. This will get messy." Issei said with a creepy look.
"A-Alright." Rias said, shaking as everyone complied.
"Boy, what do you think you will accomplish here?" Shalba asked.
"Your death." Is all Issei said as he immediately attacked Shalba sending him to the ground, then Issei proceeded to punch him through the floor bringing down some of the castle they were in. Then he fired a gigantic eraser at him blasting him through the walls and bringing down more of the castle they were in, by now the devil's bones and limbs were completely shattered.
"You damned dragon!" Shalba yelled.
"You brought this on yourself." Issei said as green energy gathered around his hand and then it stopped after he was finished gathering energy. "Gigantic omega!" Issei shouted as a huge wave of green energy engulfed Shalba making him nowhere to be seen. "Damn it. He got away." Issei said. By now the castle was completely gone, then Issei took notice of the multiple fights going on around him. He also noticed Sirzechs, Azazel and Odin here so he knew something big was going on. "Oh boy, more messes to clean up." Issei says sarcastically, then he charges up an eraser cannon. "Out of the way!" Issei shouted to the three leaders. He then threw the attack at their former location and ended up destroying the army in an instant with the wide-spread attack. As the dust settled the army of old satan faction devils were nowhere to be seen. Then Issei landed towards the group. "Well that was something." Issei said.
"Welp glad you saved us a lot of trouble." Azazel said. Then a magic circle formed below Issei and he was teleported elsewhere.
(Ophis' barrier)
Issei was teleported to a mysterious area covered in black and purple, and there was Ophis right in front of him.
"Issei Hyoudou." Ophis said.
"Hello, Ophis." Issei said getting a reaction from her, she tilted her head and replied.
"So you're not surprised?" Ophis asked.
"Why would I be? I like seeing people. Are you confused because you don't see many people react like this?" Issei asked which Ophis nodded her head. "Well it's ok, what do you want to do now that you brought here?"
"Talk to you." Ophis said blankly.
"About what?" Issei asked.
"Who are you? You feel weird." Ophis said.
"Like you said. I'm Issei Hyoudou." Issei said with a bright smile causing Ophis to blush.
"W-Well that's all for right now, I'm sending you back." Ophis said with her emotionless expression, but Issei noticed the blush. Then a magic circle with an infinity symbol appeared below Issei and he was teleported back to the underworld.
"Well that was something." Issei said.
"So what was that?" Sirzechs asked.
"Apparently, Ophis wanted to talk to me." Issei said to the leaders shock. Then the group with the ORC noticed a large portal opening and out came a gigantic red western dragon.
"Is that who I think it is?" Azazel asked.
"It is but, there is something on its back." Odin said.
"Wait, is it coming at us?" Sirzechs asked as the dragon flew towards Issei. It then morphed into a human appearance holding an unconscious Asia.
"Asia!" Xenovia shouted from afar flying towards Asia with her angel wings. Asia, now awake, saw herself embraced by a crying Xenovia, while Issei was talking to a young man in biker clothes. Then the man left while Sirzechs walked over to Issei.
"So does that mean that man at the open house was that same guy?" Sirzechs asked warily.
"Yep." Issei replied innocety to the deadpan of Sirzechs. Then Red disappeared back to the dimensional gap and the rest went back home.
Time skip
(A few days later)
The three legged race had started, Issei and Asia did some last-minute training before they got there. Then in the aftermath of the race it ended up with the former and the latter winning.
(Evie Etoulde)
"Alright my lady, we have acquired a brain cell from Issei retrieved from the remains of Rugatimu." An evie said.
"Very well done." Seraselbes said. "Now bring it to the research facility of Haz Ilyus. He will do the necessary research and we will know what this boy is truly capable of." Seraselbes ordered.
"Yes, my lady." The evie said.
(Scene skip)
Seraselbes underling had delivered Issei's brain cell to Haz Ilyus and they were now in the process of analysis.
"Interesting." Haz Ilyus said. "Well, I have already made a fully detailed analysis on this DNA and calculated what he is capable of, so you can take the results now." Haz Ilyus said.
"Thank you. Also you have been given further permission by Regalzeva to do as you please with that organic sample you have. He knows how much you like to experiment." The underling of Seraselbes said.
"Is that right? Well thank you for the information. You may now go." Haz Ilyus dismissed.
Time skip
(5 hours later)
Haz Ilyus decided to clone Issei as a sparring partner for Regalzeva.
"Sir, the cloning is almost complete. But may I ask you something?" An evie said.
"Yes?" Haz Ilyus said signaling for the evie to continue.
"Why did you decide to enhance its growth?" The evie asked.
"Because Regalzeva will be too excited to fight the boy how he is now, and do you really think a child will have a chance against him?" Haz Ilyus said.
"It's just that these recent levels that measure him are showing that he is unstable and I think that this growth enhancement has something to do with it." The evie said while looking at the cloned Issei. The clone was in a tank the size of an outdoor shed, he looked exactly like how Issei currently looks due to the growth enhancement they mentioned, and he was completely naked. "And there is one more concern that I would like to address." The evie asked.
"And that would be?" Haz Ilyus asked.
"The fact that we used a brain cell of all things to clone him. Don't you think it has leftover memories from the boy's first encounter with an evie? I heard that organic brain cells have billions of neurons inside one single cell, and now due to the cloning there are multiple as well as a full body for him to use." The evie explained.
"Well in the event that anything goes wrong I have an injection solution that will decompose the clone's body in order to stop any missteps so don't worry." Haz Ilyus said.
"Alright, thank you sir." The evie said.
Earth
(Night)
Issei just woke up from the middle of the night in his bed and he quickly noticed the number of girls in his bed. Rias and Akeno were at his sides, Gasper and Koneko were sleeping on his chest and under the covers were Xenovia and Irina with Asia in the middle.
"You alright Issei." Rias asked who was awake the whole time.
"Yes, I just had a bad feeling that woke me up from my bed." Issei said. "Hey, Rias. I want to ask you something." Issei said.
"What is it Issei?" Rias asked.
"After my trip from Kyoto. Do you want to go on a date with me?" Issei asked to the surprise of Rias.
"You have no idea how long I've waited for you to say that. Of course, Issei!" Rias replied with joy as the two went back to sleep.
(Evie Etoulde)
As Haz Ilyus worked on the project labeled "Bio-Issei" two evies affiliated with him in the devastation order have arrived. One had an elliptical-shaped mechanical lifeform with apparent cracks on his body, which has a fluorescent design. The other was a three-meter long and narrow mechanical humanoid with a blue-purplish color, with four arms and legs that possess jet propulsion at the feet.
"Bebevu Su, Gvardora. What brings you here?" Haz Ilyus asked.
"We are here to see the progress of your experiment." Bebevu Su said.
"Personally I would just just be out sparring but Bebevu Su dragged me along." Gvardora said to the annoyance of Bebevu Su.
"Anyway, what is your progress on this?" Bebevu Su asked.
"It's going very well, however multiple of my colleagues are worrying about this due to multiple erratic readings on the clone." Bebevu Su said. Then he heard an alarm which put the Keito Tenkai and the Staff Officer Deputy on full guard. The tank that held Issei glowed to the point where Issei could not be seen, then it shattered revealing Issei who looked exactly like he did when he destroyed Rugatimu, the only difference is he was completely naked. The clone then began to walk out of the area he had been set in when a metallic tube the same size of his now broken capsule enclosed the clone.
"Start the emergency injection!" Haz Ilyus shouted. Then a syringe entered the tube and the clone winced in pain signaling them that the injection was successful. "Alright so he should have-" Haz Ilyus said but was cut off by a loud bang on the tube the clone was trapped in then another second later, the clone pried open the metallic tube and desintagrated it with whatever power it could produce. Then its aura dissipated into a sludge-like pillar 17 feet tall producing more slug the spreaded out to the rest of the facility, then as the clone itself walked over the the three evies it's skin started to melt as it's body started growing. The clone was now a humanoid figure towering 7 meters matching Regalzeva in size, it no longer looked like Issei but just a swampy mess that is held together by slime, it's eyes are completely black and it has a red area on it's chest that looks like organs.
"What is that?!" Gvardora shouted.
"It's trying to resist the solution but we just have to wear it out until it eventually disappears." Haz Ilyus said. The clone charged at the three and to their surprise the clone effortlessly pushed them back. Now as the clone was in a battle with the three evies, it's pillar that the clone created produced more and more sludge, it devoured each and every evie that it came in contact with making the pillar larger each time and making it produce more and more sludge Gvardora and Haz Ilyus were knocked out of the building by the clone while Bebevu Su was incompasitated. Then the clone went to the pillar which was now 10 meters tall, then it grabbed it with the palm of its hand and then its power seemed to rise more. Then the pillar then grew 15 meters taller producing a lot more sludge than it did before. And as the clone was about to grab the deactivated Bebevu Su his hand was suddenly sliced off by a longsword. Then he saw an evie that looked similar to Rugatimu.
"You beast! I am Durmado and you have no right to live!" The identified Durmado shouted. Just then the clone at full power charged at the evie but unfortunately for the clone he was sliced into multiple pieces and blasted right out of the sky, turning it into sludged but as seemingly it wasn't finished because it went back into the large pillar that now grew 20 more meters upon contact. But then Durmado at his full power charged his sword and then striked the pillar completely destroying it. Then all the sludge it created evaporated into the air but unfortunately for all the evies that were consumed by the sludge were gone forever.
"Haz Ilyus, I hope you know what you just did." Durmado said.
"Yes sir, I got very irresponsible but we are at least lucky that it was not the real one." Haz Ilyus said.
"What do you mean?" Durmado asked.
"My original goal here after the analysis on the boy through one of his cells, I would try to clone him to make a sparring partner for Regalzeva, but as you can see that went wrong due to it tampering with its own development. But even if it was finished it would not amount to the power of the actual boy, this was proven by the fact that you effortlessly took him down, plus it barely had personality, and if this were the real one we would have suffered a lot more damage considering the fact that destroyed a galaxy once in a weaker form by accident." Haz Ilyus said.
"Interesting. Well for now I'll excuse this misstep you have made. But I shall keep what you discovered in mind." Durmado said.
Earth
(Street)
Issei, the ORC, the student council, Irina and Xenovia were walking to school then Issei suddenly stopped with a puzzled expression on his face.
"Issei-kun, is there something wrong?" Irina asked, concerned.
"If fine, but for some reason I feel disgusted. So it probably means someone is doing some shenanigans that somehow involves me." Issei said.
"Are you really alright Issei-san?" Asia asked with the same concern in her voice.
"Yeah, I'll find out who's doing what later. But now let's go to school." Issei said as the group continued to walk. "Hmm this is very strange. If someone is this stupid to do something that might make me angry then it will not look good for this world. Especially since I blew a galaxy up during training." Issei thought to himself.
Flashback
(Issei, eight years old)
{Welsh dragon, C-type!} Ddraig announced, then appeared Issei with golden hair and the same attire he had when he killed Rugatimu, except it was in his size and he did not grow and his hair wasn't green, the same couldn't be said for his aura. Then out of nowhere he started laughing maniacally as a portal opened towards another galaxy populated by evies Issei seeing this charred up an attack that he threw into the portal completely shattering the galaxy. Jin, seeing him like this, used the special ability to calm Issei down by emitting a bright purple light from his hand. "That was way too close." Jin said as he held the calmed down Issei.
(Flashback end)
That's it for this one. Now you've seen my parody of Bio-Broly in this chapter and don't worry, this is one character that I don't want to bring back. So see ya…But first.
Issei transformations:
Welsh dragon C-type= super saiyan C-type
Welsh dragon Legendary = Legendary super saiyan (Issei didn't use that in this chapter but since Bio-Issei used it i'm just putting it out there.)
Issei attacks:
Omega blaster(In flashback)
Gigantic omega
Eraser cannon
Gigantic hammer
