'I think that idea would prevent contact between the shell and the magnetizing barrel, but while in flight it would push the air away and fly at supersonic speeds, so it might be heated to over a thousand degrees by a phenomenon called adiabatic compression.'

Adiabatic compression, I've never heard of that before." It's not frictional heat, is it?"

No, it's not. My concern is that if you heat it up that high, the water inside might cause a steam explosion.'

"Would it be possible to adjust the thickness of the shell's exterior to prevent it from exploding in flight?"

I think it can be done. If it's a thick steel capsule type, it should take some time for the heat to get through to the inside.

　If the heat generated is enormous, even the water inside is heated in an instant, but it is said that the heat is not that great. However, the shells are said to be deformed if they are not sturdy to some extent.

　The next day, he went to the factory where he had the shells made and ordered a new form of shell.

"Oh, is that a cannonball filled with water?"

　The factory staff gave me a dumbfounded look.

　But I ordered several different shells. Some with different thicknesses of steel, different amounts of water to put in, and even with four stabilizing wings added at the tail end.

Isn't this a mortar shell?"

　The guy at the factory seemed to recognize the shape I specified. It looks like the shape of a mortar shell. However, the contents are not gunpowder, but water.

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　At that time, Nagase, a Class A student, reached the 40th level of the Arashiyama dungeon. He was told that there was a dwelling of Fenrir in the center of the grassland area.

　Nagase thanked the team of adventurers who had guided him to this point, and then headed off alone to Fenrir's lair. As he approached the lair with his Balmunk, a legendary magical weapon in his hand, Fenrir slinked out of sight.

　It is about six meters long and has long, snow-white fur all over its body. It has red eyes and sharp fangs peeking out from its large mouth.

　Nagase activated "Hermes Speed". The scenery around him changed to a slower one, and the movement of the grass fluttering in the wind became slow motion.

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　In a time when everything is slow, only Fenrir moves quickly. Kicking the ground with all four feet, Fenrir began to run at a furious speed, striking Nagase with lightning-like movements.

　It tries to slice through Nagase's torso with its sharp clawed paws. Nagase jumps back and ducks, then turns to the side of the pursuing Fenrir and swings his Balmunc down toward Fenrir's neck.

　Fenrir noticed this and kicked the ground with his front foot, changing direction and ducking. Nagase followed up and swung his balmunk sideways, and the tip snagged Fenrir's torso.

　White hairs fly up into the air, and the blood spurting from the wound begins to stain the white hairs red. Fenrir's hair is as tough as steel, and ordinary swords would bounce off it, but Balmunch's sharpness is so tremendous that it cuts through it as if it were silk thread.

　Fenrir roars angrily, but to Nagase's ears it sounds like a pause. The next moment, Fenrir's speed increases and he closes in on Nagase, moving in a zigzag pattern; even Nagase, a Class A fighter, can't keep his eyes on the movement and almost loses him. However, with his years of combat experience, he anticipates Fenrir's position and attacks.

　The moment Balmunch swung down, Fenrir accelerated. The sword swung down aiming at its head and sliced through its shoulder. Just when Nagase thought he had missed, Fenrir's momentum did not stop and Nagase was hit by a body blow and sent flying.

　Nagase's body flies through the air, and Fenrir leaps after him. In mid-air, Nagase avoided the attack with his sharp fangs by kicking his nose, which was protected by white fur.

　Nagase, who had taken a passive stance on the ground, quickly got up. Bright red blood spilled from his mouth. He was damaged, but so was Fenrir, Nagase thought.

　If it had been the Silver Ogre, Nagase would have been defeated with a single spear strike. This was because the Silver Ogre had the skill of spearmanship as well as quickness.

　Fenrir stopped his pursuit, apparently because of the damage done to his shoulder. The smoothness disappeared from his movements, and he appears to be protecting his shoulder.

　Nagase set himself up. He rushes over and thrusts the tip of his Balmunc up toward Fenrir's neck. Fenrir avoids it and tries to bite him. He steps to avoid it and swings the Balmunch blade down on the thick neck.

　A deep gash is carved into his thick white neck and spurts of blood stain his white fur. Fenrir raised his head and looked down at Nagase. But his body was unsteady. The slash to his neck had done great damage.

　Seeing his chance, Nagase leapt and tried to swing his balmunch down toward Fenrir's head. At that moment, Fenrir leapt forward.

　Nagase and Fenrir intertwined in mid-air. The Balmunc slashed through Fenrir's chest, inflicting a fatal wound. But Fenrir, who did not die immediately, bit Nagase's left shoulder and swung him around, knocking him to the ground.

　Nagase's entire body ached and every bone in his body made a sickening sound. But Fenrir's counterattack had only gone so far. Fenrir collapses and disappears, leaving behind a drop of goods. Among them is what appears to be a sword.

Uh-oh."

　Nagase crawls toward the sword on the ground and grips the hilt of the sword while enduring the pain. A smile appears on Nagase's face when he is convinced that it is the "Tenjugurigi-ken," and in the next instant it is distorted by the intense pain. Nagase takes out an intermediate level healing magic potion and gulps it down in one gulp while lying on the ground.

　Next, Nagase pulled a signal pistol from the storage ring and pulled the trigger straight up. At this signal, the team of adventurers he had guided would be on their way.

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　Nagase was lying on the ground when the team of adventurers arrived. The adventurers rushed to him and looked around. They feared that the dungeon boss might still be alive.

Mr. Nagase, are you okay?"

It's all right. Fenrir is down. But the last scratch...

moth (Bubalus quarlesi)

And here we are."

Did you take the healing potion?"

　Nagase nodded.

I took an intermediate level healing potion. But I'm breaking bones everywhere."

　Since the broken bones would not heal quickly, the adventurers decided to carry Nagase on a stretcher. Before that, they collect the dungeon boss's drops.

　In addition to the sword Nagase had obtained, there was a white magic stone , magic equipment armor, and a grimoire. The adventurers who retrieved them gave them to Nagase.

This is my way of thanking you for bringing me back down to earth.

　Nagase returns his magical equipment armor to the adventuring team. For Nagase, nothing mattered except for the mythical "Tenjugurigi-Sword," a magical weapon of the highest class. Even if it was worth more than a hundred million dollars, it was important to return to the earth alive.