Today was an odd day, at least for the Knight. After recent events and the big reveal it found itself being dragged into a competition of sorts in a game of a dodgeball. It honestly had no reason to participate and wouldn't have done so, if it wasn't for one simple fact. Sona asked it to do so. And Asia was invited as a guest for some reason, no clue why. Not that it minded, the girl left it's house a few days ago, so meeting her at school was the best it could hope for and a round of video games.

"How about we make it a bit more interesting, Sona?" Rias suddenly asked.

"What do you mean by that, Rias?" Sona asked.

"Knight versus Issei, one on one," She suggested.

"Why is that?" She inquired.

"Well, if Issei wins, I would like to request that both Asia and Knight come to an Occult Research Club for a tea, is that alright with you?" Rias asked.

Sona's eyes narrowed in response. "What if Knight wins though?"

"Well… what do you suggest?" Rias asked.

"If Knight wins, Rias, I would like to leave both of them alone for the next two weeks, that includes talking to them during breaks and inviting them to your club," Sona replied.

"That's too much!" Rias protested.

"Perhaps, but you were the one who suggested it in the first place, so, what will it be?" Sona asked.

"… What about our opinion on the matter?" The Knight asked.

"Good question, Rias, shouldn't you ask Knight and Asia instead of me?" Sona pointed out.

"Well… He is a member of the Student Council, isn't he?" She replied. "But I agree, so, Knight, Asia what do you say?"

"… I don't mind that, Asia?" It asked.

"Umm… I think I am fine, I will be cheering for you!" She said with a radiant smile.

"So, Rias, what will it be?" Sona asked.

"… I accept," Rias said, before turning towards Issei. "Issei, if you win, I will let you grope my breasts."

"You promise?!" He asked, while the girl nodded. "Alright!"

"… Pervert," Koneko muttered, while the rest of the girls agreed with her, even Rias looked a bit embarrassed by the display.

"Boost!" Issei yelled as he called upon his sacred gear, a crimson gauntlet.

"No sacred gears!" Sona yelled.

"But…!" Issei protested.

"… Let him," Knight replied.

"Are you sure about that, Knight?" Sona asked.

"... I am, President," It replied.

"Hell yeah, bet you are scared now, aren't you?" Issei asked.

"… No, why would I? You aren't threatening," It replied, while Issei's eyes narrowed.

Then Issei grinned, took the ball and tossed it right into the Knight, with more power than ordinary people could have. However, the Knight was ready, as it called upon a weapon it almost never used anymore, Pure Nail. The ultimate weapon of Hallownest. Crafted to perfection, the ancient nail revealed it's true form. It was pure white, with intricate design and a size… of a typical knife. Ever since it gained a new form, the blade became too small to be used. It carried it in it's bag out of sentiment more than anything else. It then used it's Pure Nail to deflect the ball right into the pervert. The ball smashed into the blade, rotating on it, before the Knight sent it back right into Issei's face, caving it in, the pervert falling on his back, big red mark in the middle of his face.

"Did I get him?" Issei asked, while dazed.

"… No you didn't," Koneko muttered.

"Knight, you used a weapon," Sona pointed out.

"… I only wish to use it to deflect the ball, is that too much?" It asked.

"No, but since Issei used Sacred Gear first, I will allow it," Sona said. "How about you, Rias?"

"I am fine with that," The other girl said.

"I will get you next time, boost!" He yelled again, standing up.

"You're disqualified, Issei, you were hit by the ball," Tsubaki said.

"But…!" He said, not able to believe it.

"… Let him play more," The Knight said.

"Why is that?" Sona asked.

"… Too easy, let him try again," It replied.

"I see… Alright, Hyodou Issei, you are back in game," Sona decided.

"Alright!" Issei yelled, as he prepared another ball.

"Should we… stop it?" Momo asked.

"I don't think so," Tomoe said."Knight seems to have it under control."

"True that, let's see how he handles Issei," Tsubasa Yura said.

"President?" Reya asked.

"Sona?" Tsubaki asked.

"I think the Knight can handle him," Sona replied. "No… I know, he can handle Issei."

"Take this!" Issei yelled and threw the ball twice as hard at the Knight, only for the projectile to be parried back into the boy's face. "Gah!"

"… Are you done?" The Knight asked.

"I won't give up! No matter what! Not when breasts are involved!" Issei yelled, most of the devils looking at him with disgust, even Saji, a fellow male was not impressed by that. "Boost! Now, I am eight times stronger than at the beginning!"

"… Eight times zero is still a zero," Knight pointed out, Issei looking like he was stabbed.

"Ouch," Kiba said.

"Ara Ara, that was quite well put together, wasn't it?" Akeno asked.

"… Not inaccurate," Koneko said.

"Shut up, handsome. You have got everything! Fame, great marks, half of the school swooning for you, you're nothing more but cheater!" Issei complained, the ball in his hands.

"…I am not a cheater, neither do I care for fame or women. You? Perhaps if you spent less time being a pervert and instead practiced or went to the gym, you would become popular yourself," The Knight pointed out, the same dull expression on it's face.

"Screw you! Boost! Take this!" Issei yelled and threw the ball.

Now, this one actually moved quite fast, still not fast as Absolute Radiance did, but definitely faster than before, eight times faster than when they first started. The Knight could hear others yelling, before it's eyes narrowed and then it hit the ball right as it was coming towards it. However, this time, it put some effort into the strike, the ball hitting Issei harder than he threw it, right in the face. The boy barely stayed on his feet, the ball doing it's best to cave his skull in, before it stopped and fell to the ground, a massive red mark on his face.

"Go… to hell, handsome," Issei muttered and fell back on his back, unconscious.

"Hyoudou Issei was knocked unconscious, no longer able to participate," Sona said, while the Student Council dragged the boy out of the playing field. "Rias, shall we begin?"

"…," Rias gulped as the rest of the Student Council entered the playing field, her own peerage right behind her.

"We can handle it from here, Knight, feel free to wait on the bench, unless you want to participate yourself?" Sona asked.

"… I will wait, good luck," It replied, turned towards Koneko and nodded. It sat on the bench and began watching how the devils handled themselves in a game like that, Asia sitting next to it.

"That was amazing," She said with a smile.

"… Not really," It replied. "… I fought harder opponents."

"You did? Who?" She asked, her head tilted to the side.

"… Too many to count," It replied.

The Knight then began watching as both of the teams began their hardest to beat the other one, unfortunately for Rias, sheer number advantage resulted in her losing terribly. In fact, the first one to fall was Koneko, who didn't seem bothered by it, as she simply shrugged, left the field, before sitting next to the Knight, on the opposite side of Asia. Momo glanced in their direction, but she stayed on the field, till the game was already done.

"Well, Rias, remember what you said, two weeks, am I right?" Sona asked.

"… Yes," Rias confirmed, sighing deeply, a lost game and two weeks of punishment. She deserved it, she supposed, but still...

"… President," The Knight began, while standing up.

"Something wrong, Knight?" Sona asked.

"… The bet, can it be annulled?" The Knight asked, while Sona blinked, Rias looking at it with a hope in her eyes.

"Why is that?" Sona asked.

"… Sounds rather harsh, just a game, Rias didn't cause any harm towards me or Asia," It explained.

"Knight is right, Miss Sitri," Asia said.

"… I see, Rias, what do you think?" Sona asked.

"Can we do that?" Rias asked hopefully.

"I suppose, if both Asia and Knight are fine with that," Sona replied with a sigh. "Rias, what do you say after something like that?"

"Thank you, Knight, Asia," Rias said with a bow.

"And?" Sona asked.

"And… I am sorry for coming up with a bet like this in the first place," Rias added.

"… You don't have to thank me, it was Asia's idea," The Knight said, while the girl blushed.

"Well, thank you, regardless," Rias said.

"Ara Ara, how nice of you two," Akeno said. "Pity you do not wish to come for tea."

"Umm… thank you for the offer, but we will have to decline," Asia said.

"… So, what do we do now?" The Knight asked.

"Well, now we can play proper games, no bets attached, now can we?" Sona pointed out. "Shall we Rias?"

"Let's," She agreed, the two teams ready for another round.

"So, Asia, have you ever hunted a stray devil before?" Sona asked, she, the entirety of her peerage along with Rias and her own peerage standing at the same abandoned mansion.

"Not really… Are they dangerous?" She asked, while Sona nodded.

"They are, Knight fought two of them before, didn't you?" Sona asked, while the Knight nodded.

"… I did, powerful," It lied.

"So, is that why you are working together on it?" Asia asked.

"That's part of the reason. Stray devils grow too strong due to lack of masters, which makes them formidable opponents for single devils. However, the reason we brought you here today was to show you how dangerous it is," Sona explained.

"I see… we will be in your care," Asia said with a bow.

"So, Rias, what is the plan?" Sona asked.

"Well, we need somebody outside to make sure the stray doesn't escape," Rias said.

"… No need," The Knight said.

"What do you mean, Knight?" Sona asked.

"… I will go inside and kill it myself," It replied.

"You shouldn't kill them!" Asia protested.

"They are monsters, Asia, not kind devils like us," Rias said.

"But…," She protested, but both of the girls shook their heads. "… Is there no cure?"

"No, devil transformation is permanent," Sona replied.

"… Please, do not make them suffer," Asia said, her puppy eyes directed at the Knight.

"… Okay," The Knight agreed. Seeing Asia like this actually made it change its mind. It wanted to just kill the devil and extract the evil piece that way, but there was a different way, one that would make all parties happy. "… Can you stay outside and keep guard?"

"You can count on us," Rias said with a smile, while Sona sighed.

"It's as Rias said," Sona added. "Although, sending you alone seems rather dangerous."

"… It's not," It replied. "… I will let you know once it's over."

"… Can I come as well?" Koneko asked, while Momo stood next to her.

"May I as well, President?" Momo asked.

"No, don't, the Knight can handle it, can't he?" Sona asked, while the Knight nodded.

"… Not dangerous," It replied.

"Alright, if it's too much run, but if something happens, I am not letting it stand," Sona warned, while the Knight nodded.

"… Understood, President," It replied and made its way inside, turning into it's battle form on it's way there.

Well, it was time to get down to it, but it wouldn't be fighting, well, not seriously at least. It wanted to change the devil back, not kill them, Asia asked it to do so after all. As the Knight made its way inside, it found the area quiet, too quiet in fact. It's blade of Void was ready, as it walked slowly scanning it's surroundings. Before, suddenly it heard a chuckle, a figure appearing in the middle of the room.

It was a woman, at least, she used to be. Her eyes were crimson red, mouth full of razor sharp teeth, a horn on her head and pointy ears. She had a tail of sorts, one that laced with sharp spikes and a blade located at the end. Her feet were similar to that of a dragon, just like the rest of her body, scale like structure covering her skin, not a shred of clothing on her, not that she seemed to care, neither did the Knight.

"What do we have here? A tasteful morsel decided to come to my lair… how nice of him," She said as she licked her lips, like a predator looked at her prey. "I wonder what you will taste like?"

"… Not good," It replied, as it got ready for a fight.

Now the problem was actually beating the devil without killing her. It wasn't something it was really good at, all things considered. Back in the Hallownest, it was kill or be killed. The fact that it had to try to not kill was not new to it, but only a handful of opponents didn't die during many fights it went through in the time it spent in the Hallownest. And it really didn't want to cut off her limbs, that took too much soul to heal. Which meant, it was time to smack the devil!

However, during that time, the devil attacked, rushing forward towards it. The Knight responded in kind by jumping in the air and smacking the devil with a side of the blade, landing on the other side of her, not a drop of blood coming from the skull.

"That tickled," The devil purred, a wicked grin on her face.

"… Will hurt next time," The Knight replied.

Alright, it had a plan, smack the devil, multiple times, until she was too exhausted to fight. Theoretically it could use the Void to restrain her, but that was the last thing it wanted to use. The devil giggled, before she rushed forward once again, the Knight jumping to the side, before it smacked her in the back of the head, a trickle of blood coming from it.

"That hurt you bastard!" She yelled, took a deep breath, before unleashing an inferno of flames towards it.

However, the Knight had seen attacks like that before, as it simply jumped in the air, using it's monarch wings to fly above the flames, away from the devil. The devil growled as she launched herself once more at the Knight. However, now that it had seen what the devil had to offer, the fight turned trivial. The devil had very limited options, her tail wasn't able to hit it, neither were her claws and the breath was easily predicted, in a way it was similar to fighting a vengefly king, one of the first opponents it fought, that or Gruz Mother. This continued on for the next minute, until the devil barely held on. She was shaking, her breathing rapid.

"Stop… dodging… so much," She spat out. "Can you just… die?"

"… No," It replied and rushed forward, the devil tried to move, but her fatigue caught up to her, the Knight smacking her right on the head, the devil seeing stars, before she fell unconscious. With the fight over, the Knight went to the entrance. "… It's done."

"So, the devil is dead?" Sona asked, while the Knight shook its head.

"… Not yet, unconscious, Asia's request," It replied.

Rias sighed, before shaking her head. "Alright, I suppose Asia will at least get a good look at a stray, before we kill it."

"I suppose… Everyone, please come inside," Sona called, devils walking inside the building. "So, that's her… she doesn't seem that hurt."

"… Isn't, smacked her, not cut her," It replied, while Sona gave it the look it recognized. "… There is a reason for that."

"Is that… a stray devil?" Asia asked, while Rias nodded.

"Yes, as you can see, becoming a stray is a fate you want to avoid," Rias said.

"… It's a bad deal to become a devil," The Knight, while Rias frowned.

"It's not that bad," Rias protested.

"… It is," The Knight argued. "… At least, it was."

"Was…?" Rias asked, an evil glint in her eyes. "Did you change your mind by any chance?"

"… No, I didn't," The Knight replied, before walking up to the devil.

"What are you doing, Knight?" Sona asked, with her eyebrow raised.

"… Fixing what devils broke," It replied, before plunging it's hand into the body of the devil and grasping the Evil Piece.

It could hear Asia yelling at it, before it began channeling both Void and Soul through the body of the devil. First the devils' jaws dropped to the ground, well, bar the Koneko, who just stared at it, her eyes spread wide open. Then, the devil began to change, her features morphed, her limbs turned to that of a human, her skin pale and a few moments later... A human female laid in front of the group, naked, black hair reaching a bit past her neck, an evil piece in Knight's hand, which it hid in it's cloak.

"… It is done, not a devil anymore," It replied, everyone staring at it in stunned silence.

"That's… impossible!" Sona almost screamed, before she corrected herself. "What did you do? What was it? Magic?"

"… Won't tell," It replied, while Sona blinked.

"What… how… when…?" Rias was just as shocked as she tried to figure out what happened in front of her eyes.

"It's a miracle!" Asia shouted, before she ran up to the Knight and hugged it, the best impression of a bear hug she could muster. "Are you a saint by any chance?"

"… Not a saint," It replied. "… Can we go now?"

"After what you did? No, I don't think so," Sona replied. "Have you got any idea how important is what you just did?"

"… No," It replied honestly, while Sona sighed.

"Knight, if you can return someone to their former self, it could save hundreds of life," Sona explained. "Please, you have to tell us how to replicate the process."

"… I won't," It replied, while Sona's eyes narrowed.

"Why not?" She asked.

"… Can't, not something you can use," It replied.

"We won't know until we try," Sona argued, while the Knight shrugged.

"… Perhaps," It replied.

"What else can you do? Read Minds?" Issei asked with a snort, while the mind nodded.

"… I can, read memories too, see them, live through them," It replied, followed by another silence.

"… Just… what are you?" Sona asked, as she tried to wrap her head around the mystery the Knight was.

"… A vessel," It replied.

Rias on the other hand was looking at it like a predator looked at the prey. Momo was looking somewhere between impressed and shocked, while Koneko seemed like she wanted to say something, but decided not to for some reason. However, this led to others waking up from their stupor.

"I have got a question for you, Knight," Tsubaki said. "Would you be against letting the devils in the Underworld know about your ability?"

"… Why do you want to do that?" It asked.

"I think it's due to all stray devils in the world," Momo said. "You could give them proper lives."

"… Will the underworld try to turn me into a devil?" It asked.

"There are probably devils that would try that…," Sona began. "However, it is possible to keep it secret under certain arrangements."

"… What would I gain in return?" It asked.

"Umm… Good Conscience?" Asia suggested, while the Knight stared at her blankly. "Are you… going to ask for a reward for doing something good?"

"… Helped out others, was given something in return," It replied. "… Too much?"

"I believe the Underworld may be willing to provide you with a reward, though, I wish you accept it regardless," Sona said.

"… May I ask for terms first? I would like to know what would be requested of me and how would it work," The Knight requested.

"That can be arranged," Sona replied and let out a sigh.

"Well, what about the process? Are you certain that we can't replicate it?" Rias asked.

"… Probably," It replied.

"So, Asia, Knight would you be interested in becoming devils now that you can return back to being humans?" Rias asked, while Sona scowled.

"Rias…," Sona warned.

"Umm… No, I do not wish to become a devil regardless," Asia replied.

"… Me neither," The Knight added, while Rias' smile dropped.

"I see…," Rias said, before sighing. "What about the whole mind reading thing?"

"… Won't tell," It replied, Rias looking like she wanted to say something, before she shook her head.

"Regardless of what happened, what should we do with her?" Tsubaki asked and pointed to the devil.

"Ara ara, isn't she a stray still, shouldn't she die for her crimes?" Akeno pointed out.

"No! Don't kill her!" Asia protested.

"President, can we wipe her memory?" Momo asked, while Sona nodded.

"That seems to like the best solution," Sona replied. "Regardless, that will take some time. It's a new development, one that Underworld is not prepared for. There is a high probability that four Satans will get involved."

"That seems rather likely, doesn't it?" Rias added.

"It is, now, I believe we should leave," Sona said. "This is a lot to take in. Thank you for showing us, Knight."

"… You're welcome, everyone," It replied. Well, there went that mystery, but at this rate, it was bound to happen, perhaps that way it could save some lives, something it couldn't do in Hallownest.

Welp, there goes that mystery. I am surprised few fictions do that. Then again, considering all the good waifus (bar Kuroka) are not stray, the stray devils appear only in volume 1 and are forgotten about. After all, Issei needs his balance breaker to get all the boobs and save the world /s.