It was a few days after the battle with the "me" from the parallel world.
I was preparing for the mysterious man's attack and spending my time learning sorcery from Kuuya-san.
"Hmm… even after seeing it again and again, it's a tremendous spiritual power."
I was practicing sorcery in the garden of Sage-san's house in another world when Kuuya-san suddenly said this.
"Is it that much?"
"The amount of Yuuya's spiritual power was amazing originally, but now that same spiritual power… No, it's actually much greater; with the spiritual power of Yuuya from the parallel world has been combined; I can't see the bottom of it anymore".
To be honest, I don't really feel that.
When I absorbed Meiko's spiritual power, I was in extreme pain.
But when I took in the spiritual power that "me" from the parallel world entrusted to me, I didn't feel anything special.
This is probably because we are the same being.
"Well, that's okay. Anyway, let's review the sorcery you've learned. Here──."
Kuuya-san waved his arm lightly, and countless imps appeared in the courtyard of the house.
These imps were the same ones that were created for me to learn how to use the power when I first came in contact with Kuuya-san, and they could only be defeated with an attack imbued with spiritual power.
And then…
"I'm going to make it a little more difficult this time."
"──Guoooooooooo!"
As Kuuya-san continued to move his arm, not only imps appeared, but also huge demons like those in the underworld.
However, the demons produced did not have the same intelligence as Ikkaku-san and Nikkaku-san.
"As you can see, it is an embodiment of the demons of the underworld. Although I cannot reproduce their intelligence, they have an ego and are powerful."
As Kuuya-san said, countless demons began to appear.
"Now the preparations are complete. Let's see the results of your training!"
"Gaaaaaaaah!"
With Kuuya-san's signal, the demons rushed at me.
I held both palms in front of my chest and stared at them calmly.
Then, a ball of spiritual power was born between my palms.
"Spirit Ball!"
As I opened my palms to release the Spirit Ball, it split into countless pieces and attacked the demons.
"Gaaaaaah!"
"Guooooooo!"
This attack destroyed the imps, but it was not enough to defeat the larger demons.
Then…!
"Spirit Chain!"
I immediately activated another sorcery, and several purple chains appeared under the demons' feet, restraining their bodies.
Seeing me like this, Kuuya-san nodded in satisfaction.
"Umu, you can now use the techniques of Yuuya from the parallel world. And the flow of activating the sorcery has not been interrupted. But that's not enough to defeat these demons."
As Kuuya-san said, the technique of "me" from the parallel world alone is not enough to defeat the demons.
That's why I've spent the last few days not only learning the techniques of "me" from the parallel world but also doing another kind of training.
That is…
"Spirit Spear!"
I raised my right hand, and a spear-shaped spiritual power was created there.
"Haaaaah!"
I grabbed the spear and threw it with great force.
The spear, which glowed purple, pierced through the bodies of the demons that had not yet broken free of their bonds.
"Oh! You used your spiritual power as a spear, huh? It must be easy for you, who uses the Absolute Spear a lot, to materialize it."
As Kuuya-san said, I created this sorcery based on the sensation of the Absolute Spear.
Yes, the other training was to create a new sorcery using the spiritual power that I could now manipulate at will.
Originally, when I went to the underworld, I had also received training in sorcery from Kuuya-san, and I had greatly improved my handling of spiritual power.
I had also been taught some of the techniques for sealing Meiko.
So this time, after learning the sorcery of "me" from the parallel world, Kuuya-san told me to try to create my own original sorcery.
Also…
"Spirit Eye!"
I stared at the remaining demons with spiritual power in my eyes.
At that moment, images of what the demons would do in the next few moments flooded my mind.
"Guoooooooooo!"
"──Spirit Sword!"
Having anticipated the presence of the demon approaching from behind with my Spirit Eye, I swung out my left hand and created a sword made of spiritual power.
In addition, I used the rotation to create a new Spirit Spear in my right hand and threw it at the demon that was in my line of fire.
"Oh! In addition to my Spirit Eye, you also created a Spirit Sword!"
As for the Spirit Sword, it was the same as the Spirit Spear, and as someone who uses the Omni Sword a lot, it wasn't too difficult for me to activate it.
That's how much I usually use the Omni Sword and the Absolute Spear.
So I had no trouble materializing it as a sorcery.
And Spirit Eye was exactly the kind of sorcery that Kuuya-san used to read my memories.
I learned that from Kuuya-san. For now I can only predict the actions of an object I see a few moments in advance, and I am not able to look into a person's memory.
However, I was sure that this foreknowledge alone would have a tremendous effect, especially in battle.
So I proceeded to exterminate the demons, making full use of the sorcery I had learned from Kuuya-san, as well as that of "me" from the parallel world.
Then Kuuya-san raised his voice.
"Now, the last one! How are you going to handle this one?"
Kuuya-san snapped his fingers, and I felt a tremendous spiritual power move unlike anything I had ever seen before.
At that moment, that enormous amount of spiritual power gathered in front of my eyes, and soon a huge demon appeared.
It was a huge demon, incomparably bigger than any demon I had ever faced before, easily over 10 meters tall.
"Spirit Spear!"
I immediately tried to attack it with my sorcery, but my spear made of spiritual power was no match for the huge demon's skin.
"What?"
"The basic structure is no different from the previous demons. But its defense and attack power are far superior to the previous demons, you know?"
"Gaaaaaaaaaa!"
"Kuh!"
The moment the giant demon swung its fist down, the ground in the garden was gouged out.
"Oops… You have to make sure the fields aren't damaged…"
Kuuya-san was casually talking about such things.
I immediately activated the Spirit Chain and bound the giant demon's body, and immediately created the Spirit Sword and slashed at it.
However, just like the Spirit Spear, the attack did not go through.
"Gaaaaaaaaaaaaaaaaaaaah!"
"What?"
The giant demon tore off the Spirit Chain that was restraining it and attacked.
"Hmm… Is it too early for this giant demon?"
Kuuya-san said as he watched the battle between me and the giant demon.
But I would not give up.
I was able to dodge the giant demon's attacks and predict its actions with my Spirit Eye, so I took advantage of the opportunity and moved away from it.
"Hmm? What are you going to do?"
While Kuuya-san tilted his head, I focused all my attention on it.
And then──.
"──Spirit Magic Armor!"
The moment I said that, a purple aura and a pale aura enveloped my body.
Yes, this sorcery that I invoked was developed based on the image of the Magic Armor.
From the very beginning of my use of spiritual power, I had been able to envelop my weapons and my body with spiritual power.
However, this was only to channel the spiritual power to the surface of the body, and it could not strengthen it significantly.
So I was able to strengthen my physical abilities with spiritual power by circulating it at high speed inside my body, not just on the surface.
Then I combined this with the original idea of the Magic Armor.
The result was a successful fusion of the two powers.
Even Kuuya-san seemed surprised by this sorcery, and his eyes were wide open.
"T-This power is…"
"Haaaaaaah!"
As I stepped forward with great power, my first step instantly reduced the distance between me and the giant demon to zero.
Kicking the ground and jumping up, I made the Spirit Sword appear in my right hand.
Then I created an airborne foothold with magic, took another hard step, and swung the Spirit Sword in my hand.
The Spirit Sword sliced off the giant demon's head, and it quietly disappeared.
I let out a sigh of relief after defeating the last of the demons and turned my attention to Kuuya-san.
"H-how was it?"
"How was it, you ask? When you show me such a fusion with the magic power you possess… I have no complaints. You've grown up so well."
"Thank you very much!"
I was relieved to see that I had reached the level of competence that Kuuya-san was looking for.
"Umu. However, there are still some sorcery techniques that I have not been able to pass on to you, and you will be able to use them more skillfully if you continue to train yourself. Most importantly, you have been able to merge it with magic power. Perhaps you can think of ways to fuse it with other powers as well."
As Kuuya-san said, this time, I have mainly been training to merge it with magic.
But I also have other powers like Holy Evil Creation and Divine Authority in me.
I don't know how much power that masked man has, but I need to become stronger to protect this world…
I decided to train once again.