Issei looking at their faces couldn't helped but chuckled. He was getting bored at not feeling any excitement and thought about visiting the magical world but he was too busy to manipulating the government to build him a tower and erect another powerful barrier but he needed first to build a connection with the heaven system or create his own heaven which would longer.
He was fully healed much to everyone shocked. Issei removed his barrier to see what kind bullets she used and found it was some sort of magical dispelling bullets place inside them. It was unique fighting style that Issei had encountered few times in his lifetime but hers was more refine than any other.
"Not bad to have bullet that dispel magical energy breaking the foundation then disbursing it completely. Furthermore, you two fought instead of running which means that you two are not human am I correct."
A monster would fight another monster for survival but human facing a monster would instantly run away as it was in their nature to do so.
"Are you an immortal, Sensei?" (Mana)
"Immortal is too much since I could still be killed but you need to be a god or other world ending creature to do so. Anyway, that was fun as your bullets was interesting. Ah… and you also have this I see you have this."
Between his fingers were bullets laced with time displacement which surprised Mana that Issei was easily took a bullet from her saving it as trump card. She was truly frighten from the capabilities of her teacher buy maintain stoic expression.
Meanwhile, Setsuna was in deep thought as she couldn't decide if issei was threat or not. Her task was to protect Konoka who was already in under the care of dragon and those that meddle with a dragon Is foolish decision.
Issei concluded that Mana and Chao linshen who was time traveler are working together of changing what future lies. He intrigued and might question the time travelling girl when the time comes. He toss the bullet back to mana who was observing her.
"Whoever made that is a genius but anyway, you two interested in joining us in training? Especially you Setsuna something tells me that your holding back."
"W-What do you mean, sensei?"(Setsuna)
"Your heart is stiff and hesitant perhaps you thought of not being worthy of someone side?"
She stiff as it was beyond accurate, Issei could easily see someone mind by looking at them. He recalled that Konoeman told him that Setsuna was guardian of Konoka who had distancing herself for unknown reason which Issei thought about many things.
'Is she into girls? Well I won't judge someone who into that.'
"Don't beat yourself to much. Life is a like blade that need time and patience to be sharpen but the most important is moving. Now then are you two going to join our training? You two already pass my simple test."
"If Sensei doesn't mind then I would like to join."(Mana)
"Me too I want to see how you able to used my blade that easily block her bullets." (Setsuna)
"Alright then lets go."
Issei snapped his fingers instantly teleporting them inside the hallway where the countless photos of woman was pasted on the wall. The new desciple was shocked from how they arrived to a new location.
"How did you that, Sensei? That was magic but…."(Mana)
"The world is full of mysteries and wonders this one of them. Well come with me."
He gestures for them follow curiously looking at the image the same As Ku Fei and Kaede when they first came in. After arriving at where they would begin training the two girls was overwhelmed by how vast the places is and how the magical energy was thicker. Setsuna was quite nervous while mana remain stoic observing everything.
"Where is this place, Sensei?"(Setsuna)
"Ah this place is sub dimension that I created myself. Its too complicated to explain but if your interested just asked the maids where the library is. Just make sure to not share it to anyone."
"Sub-dimension? Like another plain of existences?"(Setsuna)
"You really asking things huh. Well its too early for any of you to know it yet, for now you'll train and once you reach a certain power and skills then I'll tell you about it."
The four of them understood even after spending at least few days training inside the dimension, Ku fei and Kaede hadn't been inform about certain things. Issei doesn't want to be involved from other world but their own. He knew that this world is in danger but doesn't know if its external or internal threat.
After a while Issei gave training clothes to were then went to the beach side where they would begin training. Issei told Ku fei and Kaede to show their technique that they learn with Ku fei having thick black lines under her eyes and her Ki rapidly increase while Kaede form vortex of energy within her palmed. Both destroyed a huge boulder in front of them shattering into pieces surprising the two new students.
"I won't even try asking anymore."(Setsuna)
She gave up even try to understands what's going on. Issei chuckled seeing how confused she was but it was normal considering they didn't have much control over supernatural than his world.
"You two improved but need more concentration. Once you perfect these technique then we will head to next step of your training."
"Understood Aru!"
"That was certainly something. You two been only training for what three days?"(Mana)
"No, we've been training almost few months now De-gozaru."
"Few months!? How is that possible!?"(Setsuna)
"This place is time diluted and I can adjust it whatever I want but I don't want them to spending a hundred years here. Though they won't age if that were the case."
Issei narrowed his eyes to mana who wasn't even surprised considering she had her own time related item. He turn to setsuna who still trying to wracked head around it.
"Well you two shouldn't waste time and training. Here you can begin now."
Issei cloned himself and took the two in separate places where they would train. They were finally away from each other Issei confronted Man about the time traveler.
"Now then I won't train just yet but I'm interested the plan with the time traveler, Chao linsheng."
She was dumbstruk that her teacher had already figured out that Chao lingshen was time traveler but Issei was impressed of her composure. Issei could see that she was a expert mercenary with years experienced considering she's half demon in this world meaning her age is much more than what she looks.
"No need to be stiff whatever your planning I don't think I'll interfere unless its about harming someone precious to me."
Issei job was a guider and not a savior doesn't care if the world end that won't affect someone precious to him. He is indeed righteous but not foolish enough to only thing of saving the world. His simple philosophy is if its possible to help then he would helped but enough to risk those he loved. He was hypocritical but doesn't care what the world think as they could fucked themselves.
"How did you know that, Sensei? Who are you really?" (Mana)
"Well you don't know who I am but I am curious what is the plan of this student of mine. However, you don't need to tell me now because I'll trained you and show me what you got."
Issei grinned as the two began to have sparring sensation with Mana release her demon heritage. Meanwhile as they fought the other Issei with Setsuna.
"Now then we are alone I'll clear up some things. First, I am not threat to Konoka and second, as I teacher it is my job to help my student so today we will have guidance counseling."
"…I can't really tell you since its private."(Setsuna.)
"Let me guess you had fail one time I saving konoka and thought of needing to distances yourself because of that?"
"How did yo-"
"Young lady I am old that I am unsure of my age. Though I counted Hundred thousand at most."
"A hundred thousand!? How can someone live that long and still remain sane!?"
"Ah no my mind is in constant chaos that you can consider myself as mentally broken but I maintain it by changing my personality."
Issei had become strong enough to constantly hear the scream and feel the countless remorse of every living things but it was being mediated by his [Hope] that never waivered. He arrived back in time was where his personality in disarray but time passes he was able to choose one that suit him. The only personality he can't is becomes a villain as it goes against his righteous path.
"But child one failure doesn't amount to mine yet I hadn't given up so are you. Try talking to Konoka I think she thoughts that she hates you."
"….."
Setsuna looked at Issei who had broken smile that was full of remorse and regret that she felt distraught seeing it. This is the first time she saw him not smiling.
'How many mistakes and failure did you face, Sensei!?'