"...no, it's fine." Sona took a deep breath, then looked at Masa softly. "Thank you for your help, Masa."
"It's fine." Masa nodded and asked, "But I don't think this situation is normal. You should ask for your sister's help since something similar might happen in the future." If he wasn't there, what would happen?
At the same time, he wondered whether those rat youkai even appeared in the original story.
Or rather, was it his appearance that changed the story?
As Masa was in deep thought, Sona felt conflicted about asking her older sister for help, but she wasn't so stupid as to take care of everything by herself, considering the danger that she had encountered before and the possible danger that might come in the future. More importantly, like Masa, she also felt that this situation was weird as she was being surrounded and trapped. At the same time, how could such a large number of youkai enter Kuoh City, which was surrounded by barriers?
More importantly, Kuoh City was a town that was governed by two little sisters of the Four Great Satans!
Who dared to make trouble with Serafall and Sirzech with the backing of Sona and Rias, who were the two governors of this city?
Even the leaders of Youkai of East and West Japan wouldn't dare!
Yet, how could those dirty rodent youkai dare?!
"I will talk to my sister."
"That's good."
Watching his relieved expression, Sona felt helpless, realizing that the one who was weak wasn't Masa but her. Turning her head, she looked at the destruction created by Masa.
The original shape of the mansion could no longer be seen; everything was in ruin, and the forest that surrounded this place was all smashed, creating a deep and large hollow that was deep enough to form a lake. More importantly, the rodent youkai, which made her troubled and nervous, were all turned into unidentified meat that was mixed with the soil, utterly crushed by Masa.
'This... isn't his power a lion taming?'
While Sona was confused, Masa thought about the ability of his Ton Ton no Mi.
Frankly, he had many ideas on how to develop this Devil Fruit.
The first one, which was the easiest way, was to increase his body weight for an attack. It was simple, but it was also destructive.
Previously, he might say that he would increase his weight with an illusionary weight, so the physical requirement that he needed wasn't high, yet he could make a dangerous attack. Yet somehow, along the way, he decided not to take a shortcut since the heavier he was, the harder his defense was.
Increasing his weight meant that he was either increasing the gravity on his body or increasing the density of his body.
Naturally, Masa chose the latter since the denser he was, the harder his body was, increasing his defense so that he would become invulnerable.
Still, many might not understand, but what was density?
Density is a substance's mass per unit of volume.
If it was still hard to understand, you could imagine one kg of steel was much more dangerous than one kg of tofu, right?
The two had similar weights, yet the steel was much harder, stronger, and smaller than the tofu, and it was all due to the density of steel being much higher than the tofu.
This was why the increase of his physical ability was needed since the denser he was, the harder it was for him to move.
Still, due to the density of his body, as his weight increased, his defense naturally increased, and his body could even be harder than a diamond the more his weight increased.
With this ability alone, he knew that he was simply unmatched in close combat, but he felt that this wasn't enough, so he thought of a second method to make the Ton Ton no Mi stronger, which was to increase the weight of others, whether they were non-living or living beings.
If it was in the world of One Piece, it might not be so easy, as there were world rules, which made the development of the Devil Fruit harder, but this was the world of DxD, there were no such rules at all, especially when Issei could create a pervy technique where he could destroy the clothes of female, or talk with boobs as he wished even though he was just a normal human in the beginning.
This method was what he had done when Masa from the world of One Piece came to the Florian Triangle and suppressed the large waves by increasing their weight to calm them down.
Whether it was water, air, or any non-living beings, he could increase their weights as he wished to be, but if it was a living being, it might need time for him to do that, yet this was enough, right?
Still, like Masa from Mahouka, who kept developing the Pika Pika no Mi, he also thought of furthering the Ton Ton no Mi, which led him to the third method, which was to control gravity.
Weight = Mass x Gravity.
Weight is the combination of mass and gravity, so logically, he can manipulate those two factors within this world.
Nevertheless, Masa had been focusing on the aspect of mass, and he had yet to train much on the aspect of gravity.
Yet, even so, it was enough for him to destroy everything as he had previously, increasing the weight of the air to 250 tons or that of a Statue of Liberty, and he created a pressured air blast that destroyed everything.
Still, he had to say, this destruction was a bit too much, he thought.
"If you want to ask, then ask, Sona-nee."
Masa looked at Sona, who appeared hesitant.
"Um... Masa, that was..."
"My new technique."
"New technique?" Sona was dumbfounded.
"After all, even if I have a lot of powerful lions, I still want to rely on myself to fight, so I developed a new technique."
"And that's is...?"
Everyone looked at Masa, curiously wondering what kind of technique Masa had used as he could cause such destruction that even created an earthquake in the city.
Yet, while it was quite exaggerated, they also felt relieved since they knew that Masa was angry at them and wanted to protect them, so this was why he made such an attack.
Still, in the world of the supernatural, strength was absolute, and those with strength were definitely favored.
"It's a secret."
"....." Everyone.
Masa yawned and said, "I feel a bit exhausted from the trip. Do you mind if I rest first, Sona-nee?"
"...."
Sona was speechless, but she also knew that her question was rude as Masa had no obligation to tell her everything, yet there was no doubt that she was curious about Masa's technique. "Tsubaki, please take care of him."
"Yes, Sona-sama." Tsubaki nodded softly, then looked at Masa. "Masa-sama, please follow me."
"Thank you." Masa then left, following Tsubaki, who used teleportation magic to the place where he would rest tonight.
Still, as Masa and Tsubaki had left, the rest looked at the large hole and asked, "Sona-kaichou, what should we do with it?"
"Let's just buy it."
The destruction caused by Masa was too much, and it was impossible to fix, so she might as well buy this place. Still thinking about his might, she became even more curious about him.
Yet, when she was in the middle of a deep thought, a familiar magic circle appeared nearby, and she saw her best friend, who was also one of the governors of this city.
"W-What is this?!"
"T-This much power..."
"Sona, who had caused all of this?!"
"....."
Looking at her best friend, beautiful crimson hair, and voluptuous body, Sona somehow didn't want to tell the truth.
Nevertheless, those creatures who wanted to set up a conspiracy within the city didn't feel sad or angry with the death of those dirty youkai.
"What a useless creature."
"As expected, they are so weak!"
"I have told you before, Kokabiel-sama. Moreover, they are too dirty and disgusting!"
Among all of those people, all of them looked at their leader, showing their dissatisfaction with using such a dirty creature as Kyuuso.
"You don't have to worry. This is the last time, but more importantly, are you sure that last night was just an earthquake?"
Staring at the four figures before him, the man asked.
"Yes!"
"Okay, then."
Hearing those answers, the man also simply ignored the problem last night and focused on his ambition to create the Great War!