Chapter 43: [43] : Hyperbolic Time Chamber

Words : 986 Updated : Sep 27th, 2025

Chapter 43 of "In DxD with Sign-In System!" starts with unexpected events: ~ Support & Read 17 Advanced Chapters on My Patreon! ~ Thank you all for the... Find out more!

~ Support & Read 17 Advanced Chapters on My Patreon! ~ Thank you all for the amazing support!! .... Seeing the dazzling display of lightning techniques in the sky, the scene was utterly breathtaking and awe-inspiring. Everyone was stunned into silence. "Kyoya, you're really making me feel inadequate," Akeno said, a hint of self-deprecation in her voice as she returned to my side. "Now, now, Akeno, don't compare yourself to me. You'll only end up feeling worse." I chuckled, then added, "When you train later, you can try to emulate the techniques I demonstrated, or you can develop your own. If you have any questions, feel free to ask me." "As for Kiyome, I'll explain your training regimen later. For now, could you bring Rias back? It's time to activate 'cheat mode'." I said, gesturing for Akeno to fetch Rias. ... When Rias and Akeno returned, everyone looked at me with a mixture of confusion and anticipation, wondering what this "cheat" was all about. I smiled mysteriously, then took out a miniature model of a house. '???' Everyone stared at the tiny house in my hand, completely bewildered. Akeno was the first to speak, her expression slightly strained. "Kyoya, is this the 'cheat' you were talking about? Since when did you start liking such childish things?" Seeing their confused expressions, I grinned and said, "Hehe, don't underestimate this. This little thing is extraordinary. You'll be amazed when you hear what it does!" "Alright, Kyoya, stop keeping us in suspense. Explain it already!" Rias said, rolling her eyes at my antics. "Okay, okay, I'll explain!" I said, dropping the act. "This is called the [Hyperbolic Time Chamber]. It has everything you need inside: food, water, and rooms. The air is thin, the temperature fluctuates between 122 degrees Fahrenheit and -40 degrees Fahrenheit, and the gravity is ten times that of Earth. It also has a vast, seemingly endless expanse, like outer space." "Those with weak wills or who lack focus are prone to hallucinations. And the most peculiar thing is, one year inside is equivalent to only one day outside. Hence, it's the ultimate training location. However, a person can only enter for the equivalent of two days in their entire lifetime. If you exceed that limit, the exit disappears, and you're trapped forever." "Boom!!!" Hearing my explanation, everyone was stunned! Training inside for one day was equivalent to training for an entire year outside! My words were like a bolt from the blue, leaving Rias and the others frozen in place. Training for a year in just one day was something they had never even dared to imagine. "Changing the flow of time—This..." "Kyoya-senpai, are you joking?" "Th-this is—It's unbelievable." "Kyoya, are you sure you're not just teasing us?" Rias asked, her mind reeling. Seeing their reactions, I couldn't help but chuckle. "Did you hear me wrong? Not only can this [Hyperbolic Time Chamber] simulate any training environment you desire, but it also alters the flow of time." "In short, you don't just have seven days to train before the Rating Game. You actually have two years and five days. How about it? With my cheat, are you confident you can beat that 'turkey' now?" Everyone's eyes lit up, and they all showed expressions of excitement and eagerness. "Kyoya, let us try it out!" Rias urged, unable to contain her excitement. ... I didn't drag it out any longer. I tossed the [Hyperbolic Time Chamber] into the air. The miniature house rapidly expanded, growing from the size of my palm to the size of a normal house, before finally stopping. Everyone watched this transformation in awe, marveling at the sight. Then, we all gathered at the entrance of the [Hyperbolic Time Chamber]. I took out my phone and set a timer. Rias and the others had just heard my brief description of the [Hyperbolic Time Chamber's] wonders but had yet to experience it for themselves. So, they decided to send someone in to test it out. "I'll go in and take a look!" Akeno volunteered, stepping forward. Everyone else waited outside. "Once you're inside, don't wander too far, or you might get lost." I reminded Akeno before she entered. Akeno nodded, opened the door, and stepped inside. She felt as though she had entered another world. The gravity was noticeably heavier, making her feel a little uncomfortable. The space inside seemed to stretch on forever, a vast, white emptiness with no end in sight. It made Akeno feel incredibly small. Remembering that I had called this a training artifact, she decided to test it out. She raised her hand and aimed at a spot on the ground nearby, unleashing her strongest attack. But the normally destructive lightning blast, when it struck the ground, caused no damage. The ground was completely unharmed. Akeno was shocked. Her strongest attack hadn't even left a scratch. But this also meant they could train without worrying about damaging the place! ... Finally, after exploring the space for about an hour, Akeno decided to leave. Outside, Rias and the others were startled to see Akeno emerge so quickly. "Akeno, why did you come out so soon? It hasn't even been a second." Akeno explained that she had been inside for about an hour. Everyone was amazed by the [Hyperbolic Time Chamber]. "It's a miracle training artifact!" Rias exclaimed. "Not only that, but the gravity inside is almost ten times that of the outside world. And the space inside is practically limitless. Even my strongest attack didn't leave a mark on the ground. It's a natural training ground!" Akeno added. ❁❁❁❁ ~ Push the story forward with your Power Stones ~ Every 400 PS = Bonus Chapter! ❁❁❁❁ ~ 17 Advanced Chapters Available on Patreon! https://p-atreon.com/dragonnx (Just remove the hyphen to access Patreon normally.)

Chapter 43: [43] : Hyperbolic Time Chamber

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