In the Occult Research Club everyone was staring at Issei with shock and disbelief. What did they just witness? True teleportation, without the use of magic runes or the Gremory Seal? And this was supposed to be their newest member, with the least amount of experience; what a joke.
Issei's eyes were cold as he looked at Rias. Even though he liked this woman, she was really starting to get on his nerves. First she tried to pressure him into being her servant and now she prevented him from acting on his wishes. He said "What's your problem? Why are you getting in my way?"
Rias was still trying to process how a newly reincarnated devil could have such impeccable control over magic; especially a magic as esoteric and mystical as space magic. She said "What? Why are you upset?" She truly didn't understand why Issei was mad. In her view she was just rescuing a friend who was besieged by fallen angels.
"You teleported me without my consent before I could save that girl! And that lousy teleportation cost me so much time, that they were gone when I went back to go check on them!"
"Wait is that really why you're upset? We rescued you before their superiors reached that location! If we were a minute late, that place would have been surrounded by fallen angels. Even I don't dare take on most of the high ranking fallen angels around my territory at the same time."
Issei took a moment to calm down after he understood that Rias was not acting against him with malice. He was still a bit annoyed that Asia was somewhere with those fallen angels that treated her like trash, but now there was nothing he could do. He could only hope that she made it out ok once the higher ranking fallen angels arrived on the scene.
After Issei calmed down, Akeno said "You… Where did you learn such complex magic?"
Issei didn't bother to explain himself, he said "Self-taught."
"Could you… teach me..."
Issei wasn't expecting the situation to play out like this. Akeno was asking him sincerely without any tricks or hints of her usual playful aura. For someone who usually acted in whatever manner would rile her friends up, this was a new side Issei had never seen.
Issei said "What do you want to learn?"
"You know more than teleportation?"
"I have… quite a few tricks."
"Do you know any thunder magic?"
Issei busted out his Demonic Lightning Elemental Creation and Coating. He couldn't risk using his Demonic Lightning Beam or Lightning Field as these skills would ruin the school. He said "I have two more lightning style skills, but they are very dangerous and could potentially destroy the school so we'd have to go somewhere isolated for me to teach you."
As Akeno watched the redish-black thunder shoot sparks out of Issei's hand and a similarly hued thunder aura cover Issei's body her smiling face changed to shock again. These were pure demonic sparks that only pure devils with the highest level of control could wield.
Akeno held out her hands and condensed some holy lightning to show Issei. She said "Your demonic lightning isn't compatible with my holy lightning… Sorry for wasting your time."
Issei switched the composition of his Lightning Elemental Creation to suit the holy energy Akeno was using and the redish-black thunder changed to the purest bluish-white color. As long as the skill Issie used was not governed by the principles of duality, he could freely switch between the demonic and holy variants of his skills. Issei said "And here I thought I would be the only devil able to use holy energy."
Everyone looked at Issei with caution now that they watched him handle holy lightning of the highest caliber like it was nothing. They all knew just how dangerous regular holy lightning would be to devils; without even mentioning this holy lightning that could put archangels to shame.
Rias said "You… How did you?"
Issei cut in "Remember back at my house when you tried to pressure me? Just take this ability of mine as being a part of my bloodline."
Akeno said "So you're like me huh? Did you use to be a pure angel or a fallen angel?"
"Neither." Issei didn't feel like explaining himself and no one was in a position to pry that information out of him.
Akeno thanked Issei and the two started talking about lightning magic. To Issei's surprise he discovered that this world was completely different than his past world with regards to energy levels. Here, everyone used law principles as the basis of energy manipulation; they directly skipped that lower levels of particles and energy.
His discussion with Akeno gave him many insights with how best to use holy and demonic lightning; directly increasing his proficiency with all the skills that used lightning law principles. Obviously they couldn't finish a conversation of this nature in one sitting, so after a couple of hours of Issei and Akeno exchanging information, they separated and went home; overall, the discussion was highly beneficial to Issei.
Issei learned that unlike his home universe, the world's power structured revolved around either holy energy or demonic energy. Thus, the only way to directly increase in power were to increase one's manipulation of these types of energy. The problem was… There would be no way to study from the world. Issei would now only be able to accelerate his mastery of the law principles — of holy energy and demonic energy— through discussions like the one he had with Akeno.
Issei walked back home and digested what he learned from Akeno through the continuous application of thunder magic. Once he was done, he continued with his routine of Body Refining and Clone exploiting. The next day, as Issei walked to school, he was pleased to see that Asia was ok. He felt bad for leaving her behind, so he invited her out to a little date; its the least he could do.
Issei had plenty of money now that he no longer spent his allowance on porn mags and special "accessories" everyday, so he took Asia out to eat breakfast. After their breakfast, Issei and Asia eventually ended up in a park, right next to a flashy fountain.
There, Issei tried to convince Asia to leave the fallen angels. He said "Asia, I know you're very religious, but as a friend, I urge you to stop interacting with those kinds of people."
Asia said "Issei, I know you mean well, but the church is all I have… It's all I need. Nothing can replace the image of god in my heart, so as long as I can be helpful, I will do god's work!"
"Really? If that's the case, why are you with fallen angels?"
"That… that's a long story. You see, before I was excommunicated from the church I was known as a saint for being able to heal others with my prayers. That was how I got in the church in the first place. I worked as much as possible to heal everyone and lessen the world's suffering, until one day I healed a man I shouldn't have healed.
The man I healed was a devil and after the church got word that my healing could work on not just people, but devils, they immediately made me an outcast; they called me a witch. Ever since, I have kept going about me life trying to live with god's teachings in my heart. I just can't bare to stop using my powers when I know that can be used for the greater good."
"Mhmm? So the you went to the fallen angel's side after you were tossed away from the church? If you've already lost your place with the angel's faction, why not just come to the devils side? It wouldn't make a difference if you can keep healing people. Right?"
"Huh? Me join the devils? I would never cast away my humanity just because the church and the angels distanced themselves from me."
"Cast away your humanity? What do you think being a devil is like? Do you think I'm void of my humanity?"
"No, of course not! I know Issei is a good person who has a good heart. There's no way you would be evil like those devils."
Issei showed a mischievous smile and stretched out his two arms before Asia. In his right hand a small ball of holy light manifested, but on his left hand demonic fire burned with intensity. Issei's actions somewhat broke everything Asia knew about devils and her perception of them. Even while ignoring that Issei could use both holy and demonic energy, Asia could not comprehend that devils could have emotions.
With a smile still on his face Issei said "So. Do you think I'm evil now, just because have demonic magic?"
"Issei's a devil?"
A new voice cut in suddenly. Issei and Asia turned to see a new fallen angel floating above the fountain right next to them. This fallen angel sure knew how to pick an enticing attire; her outfit consisted of just string-thin pieces of cloth covering her most important parts.
The fallen angel said "My my, what do we have here. I can't believe my boyfriend didn't die like I asked~"
Asia said "Raynare! Why are you here?"
"Why am I here? Why are you talking so chummily with a devil?"
"He's not a devil! He can use holy magic..."
"Huh? Why are you lying to m..." Raynare could not finish her sentence as she noticed the ball of pure holy light coming from Issei's hand. She said "What! That's impossible!"
Issei ignored this weird lady as she would soon not exist. The system finally answered his call for more points!
[New Mission Alert~
Mission: Defeat Raynare. Rewards: 9,000 shop points.]
[Bonus~
Bonus Mission: Beat your "first" girlfriend without resorting to demonic energy. Rewards: 900 shop points.]