Chapter 145

Words : 1220 Updated : Oct 8th, 2025

Chapter 145 - 145 "Since this kind of battery doesn't work well, then let's just make a different kind of battery!" Natsuki was struck with inspiration by the word "battery." If the Yin Fūin (Yin Seal) is a long-term storage battery for chakra but inconvenient for immediate use, then why not create a new kind of battery? One that can store chakra at any time and be used at any time? Come to think of it, the Bijū (Tailed Beasts) are essentially oversized batteries. And the reason those batteries work is naturally because of fūinjutsu (sealing techniques). Sealing a Bijū is essentially sealing chakra. Given that, why not base it on fūinjutsu and create a chakra battery? One that can be charged during downtime and drawn upon when needed. Wouldn't that solve the problem? Natsuki immediately shared the idea with Tenten. "If we can make such a battery, you can prepare several in advance. Then you won't have to worry about running out of chakra. But this requires more advanced fūinjutsu. I've gotten a few from Jiraiya, but I haven't mastered them yet... I'll have to find time to ask Kakashi-senpai." "Natsuki!" Tenten suddenly interrupted, her eyes sparkling. "I knew it! You'd definitely come up with a solution. I'm really looking forward to your so-called chakra battery!" With that, she wrapped her arms around Natsuki's neck and kissed him. Natsuki didn't say much more and gently responded to her kiss. Hmm, it tasted like Ichiraku Ramen! But at the entrance, a few kids who were about to buy ninja tools stood there, blushing furiously as they sneakily watched. The next day, Natsuki found Kakashi in a pile of rocks. It seemed Kakashi had no mission for now and was focused on training Sasuke. "Kakashi-senpai, you're pretty busy, huh?" Natsuki greeted him, watching as Sasuke concentrated lightning in his hand and stabbed at a boulder like he was self-harming. He couldn't quite figure out what Sasuke was trying to do. Kakashi quickly closed his book and replied, "Oh, yeah, pretty busy. What brings you here?" Seeing Natsuki watching Sasuke, Kakashi casually explained, "Sasuke wants to develop a new technique, so I helped him come up with a training plan. It seems he wants to shape lightning chakra into a spear, so he's stabbing the rock." A spear? Was he trying to create Chidori Eisō (Chidori Spear)? Looks like Sasuke had his own ideas. Hearing the commotion, Sasuke just nodded at Natsuki and continued training. Natsuki sat down next to Kakashi and got straight to the point. "Kakashi-senpai, I actually want to create something called a chakra battery. It requires advanced fūinjutsu. I got four fūinjutsu techniques from Jiraiya-sama, but I haven't figured them out yet. I was hoping you could teach me. Also, if you know any more, please teach me!" "Chakra battery?" Kakashi was intrigued. "What's that? Why do you suddenly want to make such a thing?" Natsuki didn't hold back. "Tenten has a talent for space-time ninjutsu. I've also been having her try to learn Hiraishin no Jutsu (Flying Thunder God Technique). She's now able to attempt transporting small objects. The only issue is her chakra reserves are too low. So I want to design a chakra battery for her. She can store chakra in the battery during downtime, and when she runs out of chakra during battle, she can connect to the battery and draw from it. That should solve the problem of running out of chakra temporarily." "Wow! You really are full of ideas!" Kakashi couldn't help but be surprised. He hadn't expected Natsuki to think of such a thing. He had to admit, it was a great idea. With a Sharingan, Kakashi was always burning through chakra. Despite his reputation as the Copy Ninja who had copied over a thousand jutsus, he could only use a few high-level jutsus in battle before his chakra ran out, significantly reducing his combat power. If there were chakra batteries, even if he usually ran low on chakra, he could store up during downtime. Then, at critical moments, he could connect to the chakra battery and not worry about running out of chakra. So naturally, he fully supported Natsuki's idea. After all, he had already taught Natsuki his family's kenjutsu—what was a bit of fūinjutsu in comparison? If Natsuki really succeeded in creating this, Kakashi himself could benefit as well. "This chakra battery idea is excellent!" It was Sasuke who spoke up. He paused his training and walked over. "Natsuki, you're as smart as ever. To think you'd come up with this. But can fūinjutsu really be used to make a chakra battery?" Natsuki nodded firmly. "Absolutely. Look at the Bijū. They're pure chakra beings, and fūinjutsu can seal them into a person and allow the host to draw on the Bijū's chakra. Isn't that just a giant battery? Based on this idea, using fūinjutsu to create a battery that stores our own chakra for use later is completely feasible. ...Also, someone has already done it. One of the Sannin, Tsunade-sama, uses a technique called the Yin Fūin. She constantly stores chakra in it, which not only keeps her youthful but also lets her unleash tremendous power when the seal is released. However, the Yin Fūin isn't ideal as a battery since it can't be casually opened. But creating another fūinjutsu that allows chakra to be stored and retrieved at will shouldn't be too hard. Besides, I'm not planning to store it inside the body but rather in an external object, which should be simpler." Kakashi and Sasuke couldn't help but ponder. They had to admit, Natsuki's reasoning was solid. There was the Jinchūriki example, and Tsunade's case—clearly, the idea of a chakra battery was completely viable. Based on Kakashi's understanding of fūinjutsu, using an external object as the medium, it really shouldn't be that hard to make a chakra battery. After all, if he could seal even Orochimaru's Juinjutsu (Curse Seal), then creating a container that seals ordinary chakra should be much simpler. "This can be done! I'll teach you more advanced fūinjutsu techniques!" Kakashi agreed, his eyes even showing a hint of excitement. He was looking forward to breaking free from his "out of chakra" state. Natsuki was overjoyed. "Thank you, Kakashi-senpai! Don't worry, I'll make it work!" Kakashi smiled. "I believe in you. Just don't forget to give me a battery once it's done." Sasuke quickly spoke up. "Give me one too! No, give me several. I'll pay for them!" He couldn't help but feel excited inside. He had considered becoming a Jinchūriki to solve his chakra shortage problem, but with no solo Bijū available and no knowledge of how to seal one, that idea had been difficult to pursue. Now, Natsuki had come up with the concept of a chakra battery. Wouldn't that temporarily solve his problem of not having enough chakra? (End of Chapter) [Check Out My Patreon For +20 Extra Chapters On All My Fanfics!!][/zaelum] [+500 Power Stones = +1 Extra Chapter] [Thank You For Your Support!]

Chapter 145

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