Ultimate Highschool DxD

Issei teleported with the unconscious Kuroka, Rias and Shirone into his pocket dimension before Bikou appeared. The moment he left Bikou appeared within the exact same place. He tilted his head and looked around to find Kuroka. He sensed that she was in trouble so he came here as soon as he could. But now she isn't here. Bikou wasn't a fool to just think of this a fluke or as a mistake.

Kuroka was definitely here just a moment ago. Her for must've been very strong who manged to defeat and even kidnapped her. Bikou was able to tell so Bikou he could find a trail of Kuroka's aura, but then the trail had suddenly disappeared. Who could've done such a thing? Kuroka came here to take back her sister, who also happens to be a rook of Rias Gremory. 'Wait a minute! That Issei is also in Ras Gremory's peerage. He must've been involved in this and he should be the one who defeated Kuroka and kidnapped her!' Bikou thought. Understanding the situation, he immediately teleported back to Cali to report the situation to him.

....

Elsewhere in Issei's pocket dimension, he appeared within an empty with the unconscious trio and laid their bodies down on the floor. A white magic circle appeared on his palm as he used healing magic to heal the wounds and injuries on Kuroka's body and to heal Rias and Shirone from he damage the poison mist caused within their nervous system. When all of them got filly healed the three of them lowly opened their eyes sat the same time.

Seeing the familiar as they already had been here, Rias and Shirone didn't panic and slowly got up on their feet. But Kuroka who noticed the changes in her surroundings quickly rose back to her feet and took a fighting stance while looking at Issei with a force glare.

Issei released a sigh seeing her reaction and before she could do anything, he explained the situation.

"This is my pocket dimension. It's a set of my own personal dimension. All of your injuries have been healed Kuroka, so relax a bit." Hearing his words, Kuroka looked at the surroundings with surprise clear in her eyes. She never would've thought that someone could've their own personal space. How fascinating! When she heard the latter part of Issei's words and was again surprised to see that all of her injuries had been completely healed. She even felt more energetic than ever before.

"So why did you bring me here~nya? Why didn't you kill me~nya?"

"I didn't kill you because you're Shirone's older sister. And I brought you here to clarify something's."

"I noticed it earlier but didn't say anything to our situation, Issei why are you calling Koneko by that name?" asks Rias.

Issei then explained everything to Rias. Kuroka and Shirone's past, that they were the daughter of a Nekoshou named Fujimai and they were experimented on since early childhood. How Kuroka killed her master to save Shirone and took all the name on herself for the sake of the future of her younger sister. Rias had a look of melancholy on her face, she never expected Shirone and Kuroka to have such a dark past. She also regretted the fact that without doing any investigation she believed that Kuroka killed her master being drunk on power and left her younger sister. Kuroka had a sad look on her face as her past was revealed, she didn't want to reveal it to Shirone since she didn't want Shirone o be sad and preferred to be hated by her sister rather than seeing her sister cry. She was also surprised from the fact that Issei knew so much about their past. Shirone had a look similar to her sister but their was also guilt in her eyes. After Issei finished explaining everything, Kuroka walked over to Shirone and stood in front of her.

"Shirone... I'm sorry that I didn't tell you anything~nya. I just didn't want you to be sad~nya. At that time I though this was the best course of action and still today I feel that I made the right decision~. I know that you're hurt because of me, I'm sorry, I'm so sorry~nya." At the end of her words warm tears start trickling down from Kuroka's cheeks.

"I'm sorry as well Kuroka. I never once gave a single thought to anything and thought that you killed your master by being drunk on power. I never tried to understand you...I'm so sorry! Uwaaa!"

Shirone couldn't hold back her emotions any longer as she hugged Kuroka tightly and started crying. Kuroka also started crying with Shirone in her arms as they reciprocated each other's hugs. Seeing this scene unfold in front of their eyes Rias and Issei felt relief wash over than as they saw the two sisters reuniting.

After a while both sisters finlly calmed down. But they still continued to hug each other, as they hadn't met each other for a long time. But hen Issei interrupted them with his next words that caused all of them to be shocked, especially the pair of sisters.

"I reunited both of you, but seeing as you're so happy in other's embrace I'll do you another favour. I'll revive your mother back to life." Saying so, Issei took out the Sephiroth Graal that caused everyone to be shocked. He had the Holy Grail! Issei used the Grail's subspecies Balance Breaker which had three separate Grails. Issei was always using it's Balance Breaker, but he unlocked it's subspecies Balance Breaker only a while back. Naturally he was happy as the subspecies Balance Breaker of a Sacred Gear is stronger than its normal Balance Breaker. His subspecies Balance Breaker was the same as Valerie's subspecies Balance Breaker in the original timeline.

When he used it's powers, the Grail began shining as a bright golden was being emitted from it. The light began trailing into the shape of a humanlike body until the body finally appeared in the form of a highly beautiful lady. The pushed the soul of the body back into it as she slowly opened her eyes making her enchanting golden eyes visible to everyone in the room. Issei then put the Grail back as he looked at the woman in front of him. Things were about to get interesting....