Chapter 42 – The Door-Door Devil Fruit
"Summoning Technique: Millennium Dragon!"
With a swift bite to his thumb, Yusuke weaved through a set of hand seals and slammed his palm onto the ground.
In the next instant, a massive creature burst forth from the summoning circle—its body cloaked in emerald-green fur, giant eagle-like wings spread wide from its back. Its face resembled that of a dragon, its tail coiled like a serpent, and its limbs ended in razor-sharp talons. Its presence alone was overwhelming.
"W-What is that…?" Hatake Sakumo muttered, stunned. He had seen countless summoning beasts before—Jiraiya's toads, for instance—but this one rivaled even Gamabunta in size. And with its wings unfurled, it looked even more majestic than Gamakichi.
"It's called the Millennium Dragon," Yusuke replied, offering no further explanation. His gaze then shifted to Kakashi, who was staring wide-eyed, his face practically glowing with awe.
Yusuke smiled softly. "Kakashi, would you like to form a contract with him?"
"Are you serious?! I really can?!" Kakashi's voice rose with excitement.
"Of course. I didn't offer it earlier because I was worried you'd rely too much on summoning beasts. But now that you've become a Chūnin… and considering how dangerous the shinobi world is right now, it's time."
Yusuke pulled out a long summoning scroll and unrolled it.
"Write your name here. You too, Father. The Millennium Dragon has excellent aerial combat ability. It could be a powerful asset."
Sakumo nodded without hesitation. A flying summon of this caliber was practically unheard of—let alone one willing to form contracts with humans.
Kakashi pressed his hand to the scroll. With a puff of smoke, a miniature version of the dragon appeared at his side.
Sakumo summoned his own version—equal in size to the one Yusuke had brought forth.
"Kakashi, focus more chakra into it," Yusuke reminded him.
"Got it," Kakashi said, then clasped his hands together.
Summoning Technique!
Another dragon appeared—slightly smaller than Sakumo and Yusuke's versions, but still impressive.
Yusuke gave an approving nod. As expected of my little brother… Truly gifted.
"So, what do you think? Like your new partner?" Yusuke asked with a grin.
Kakashi nodded eagerly. "Yes. Thank you, brother."
"Alright then, you may all return," Yusuke said, addressing the dragons.
"As you wish, Yusuke-sama," the four dragons responded in unison, their voices deep and regal.
(Why can they talk? Because the system only delivers the best.)
After helping Kakashi with some practice, Yusuke returned home.
— — —
Checking the Reward
"Time to check my loot," Yusuke muttered to himself. Ever since returning from the Hokage's office, he had completed the necessary tasks. Now, he was curious what his system reward would be.
Ding! Congratulations! You have acquired a Paramecia-type Devil Fruit – Door-Door Fruit.
"…Didn't expect that one," Yusuke said, surprised but satisfied.
While not as direct as the Glint-Glint Fruit in combat, the spatial utility of the Door-Door Fruit was a massive asset. With it, anything he touched could turn into a door—a passage to another space or even another location.
It granted him near-instant mobility, akin to the Flying Thunder God Technique. But what made it even more impressive was the private dimension it created—similar to Obito's Kamui, but better. From inside, Yusuke could view the outside world in real-time. The dimension was identical to the real world, yet completely invisible and inaccessible to anyone else.
Without hesitation, Yusuke activated fusion.
Ding! Fusion initiated.
The pain was intense—but not enough to knock him out.
"What's going on, System?" he groaned through gritted teeth.
[Due to your vastly enhanced body, the fusion process can now be endured consciously.]
Two grueling hours later, the fusion completed.
"Alright, let's see what you can do," Yusuke said.
"Open: Air Door."
Raising his hand, he created a swirling green ripple in the air—like a door sliced into reality. Beyond it lay a room… one identical to his own.
He stepped into the space, dubbing it Dimensional Space. Everything was a perfect replica of the real world.
Yusuke wandered to Kakashi's room, quietly watching his little brother sleep. A smile crept across his face. He stepped out, gently covered Kakashi with a blanket, and then returned to the dimension.
Hours of experimentation later, he'd learned the fruit's full potential.
From within the Dimensional Space, he could open doors to other places and teleport instantly—but the range depended on his perception. Given his light-speed movement, even far-off locations were just a step away—though the energy cost was steep.
He rarely used Glint-Glint Fruit for teleportation anyway—only in special cases, like warning the village elders.
Even more useful, he discovered he could mark locations from within the Dimensional Space—just like the Flying Thunder God Technique. He could then teleport to those marks, regardless of distance, even if he couldn't sense them.
It was perfect.
Unlike Glint-Glint Fruit, which only affected his own body—and would burn anyone else who came in contact—this fruit let him teleport with others safely. And even now, he wasn't quite on Kizaru's level yet.
— — —
Breaking into Tsunade's Home
"Open: Air Door."
Yusuke slipped into the Dimensional Space once more, then opened a door leading straight into Tsunade's residence.
Immediately, a wave of alcohol hit his nose.
He winced. That's strong.
Tsunade was sprawled across her bed, half-naked, sleeping soundly.
Yusuke quickly turned to leave. This is bad. Very bad.
"Stop right there!"
A furious voice echoed through the room. Despite being asleep, Tsunade—ever the Kage-level ninja—had sensed his presence the moment he appeared. And Yusuke hadn't bothered suppressing his chakra.
"Ah… Tsunade, you're awake?" he said awkwardly, one hand still holding the air-door open, looking hilariously guilty.
"I can explain—really!" Yusuke said, flustered.
"Oh, I'm all ears. Go ahead," Tsunade replied coldly, her expression darkening.
"I was just testing out a new technique! I swear I wasn't peeking!"
"You can explain to the Shinigami when you get there!"
Tsunade lunged with a punch.
She didn't use her full strength—but still, a hit from Tsunade was no joke.
"Ugh—Elemental Form!" Yusuke shouted. In a cramped room like this, his light-speed couldn't fully function—he couldn't turn corners mid-flight.
Her fist collided with his torso, and half of his body vanished—not with blood, but shimmering light particles. His form reassembled immediately.
"Let's not fight, Tsunade. How about we talk this out instead?" he said, putting on his best peacekeeping smile.
"After I land one hit, then we'll talk!" she growled.
Tsunade knew full well how absurd Yusuke's powers were. Only her Busoshoku Haki could even touch his elemental body. Five-element Ninjutsu didn't work. Genjutsu might, but he had Haoshoku Haki—which made him nearly immune to illusions.
"If you destroy your own house while trying to hit me… you'll be the one with nowhere to live," Yusuke said calmly.
"Tch…" Tsunade grumbled, reluctantly backing down.
"So? What are you doing here? And how the hell did you get right next to me without me noticing?"
"I wanted to show you a new technique," Yusuke replied with a cheeky grin.
"What kind of technique?"
"One that lets me go anywhere I want. Just name a place—I'll take you there as an apology."
"Tch, forget it. I'm going back to bed," Tsunade huffed. She was still suspicious. She could tell Yusuke wasn't telling her everything.
"…Fine, fine. I'll be honest. Where do you wanna go?" Yusuke offered.
"…Take me to Shōtensugai," Tsunade finally said. It was the biggest casino town in the Land of Fire.
"No problem. It's a bit far, but I can do it with a few jumps."
"Then let's go," Tsunade said, as Yusuke gently took her hand.
Her face turned red—but she didn't pull away.
Yusuke, meanwhile, seemed completely oblivious.
"Open: Air Door." He sliced a portal open in midair.
"What… is this?!" Tsunade gasped.
— — — — — — — — — — — — — — — —
Join my Patreon here:
🔗 patreon.com/FaaanzKun
✅ Enjoy 40+ chapters ahead of WebNovel
✅ Get 1-2 new chapters every day exclusively on Patreon
Join my Ko-Fi here:
🔗 ko-fi.com/faaanzkun
Join now and dive deeper into the story—weeks ahead of public release!
Thank you for your amazing support 💖
— — — — — — — — — — — — — — — —