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The Angel That Shouldn’t Exist In Tensura

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Synopsis
Kanzaki Rei lived by one rule: trust leads to loss. After his death, he awakens in a world that shouldn’t exist—trapped inside a broken, angelic body that rejects him. Neither human nor truly divine, he becomes an anomaly the world itself cannot understand. While others rely on bonds and trust to survive, Rei chooses calculation and control. But in a world shaped by connections next to Rimuru Tempest side his logic begins to fail. In a system that has no place for him, Rei must decide: Remain an error… or become something far more dangerous. ———————- Hello, author here. I hope you’ll give this story a try! I noticed there aren’t many fanfics about That Time I Got Reincarnated as a Slime, so I decided to write one myself. Please note that English isn’t my first language. I may make some mistakes, and I also use tools to help with grammar. If you notice anything that could be improved, feel free to let me know—I’d really appreciate it. I do not own any rights to Tensura. All credit goes to the original author.r
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Chapter 1 - Chapter 1 – An Unfamiliar Body

— Rei POV —

The cave was quiet.

Not completely silent, but close enough that every small movement stood out—the faint echo of footsteps, the soft shift of air against stone, the subtle rustle behind me that didn't belong to anything I remembered having.

The wings.

I had been ignoring them.

That wasn't sustainable.

I stopped and exhaled slowly before shifting my weight. The movement felt natural enough, but when I focused on it, something responded behind me—a slight adjustment, like an extra limb I hadn't learned to use yet.

So they weren't just attached.

They were mine.

I turned slightly, catching a glimpse of them in the reflection of a crystal embedded in the wall. Pale near the base, darker toward the edges. Not symmetrical in color, but balanced in shape.

Incomplete.

That was the impression that stayed.

I moved them again, this time intentionally.

There was resistance at first, then a delayed response, like something connecting piece by piece. The motion was clumsy, inefficient, but functional.

Enough to confirm control.

"…Good enough."

There was no reason to rush it.

The cave extended further ahead, the light fading the deeper it went. The air felt dense, heavier than it should have been, carrying something unfamiliar—something that didn't belong to the world I remembered.

I walked.

Carefully at first, then more steadily as my body adjusted. Each step felt more natural than the last, like whatever I had become was already adapting faster than I was.

That would be useful.

A faint sound echoed somewhere ahead.

Not movement. Not quite.

A drip of water.

I followed it.

Not because it mattered, but because it was something measurable. A reference point in an environment that otherwise had none.

The path narrowed slightly before opening into a wider space. A small pool had formed where water collected, the surface disturbed only by slow, consistent drops from above.

I stepped closer and looked down.

The reflection stared back at me.

Blond hair—lighter than it should have been, almost golden under the dim light. A darker streak cut through it, uneven but distinct. My eyes were… different. Brighter. Too clear.

I held my gaze for a moment, studying the details without reacting to them.

There wasn't much point in denial.

"I see."

The voice sounded the same.

That was enough.

I crouched slightly, reaching toward the surface of the water. The reflection distorted as my hand broke through, the ripples spreading outward before settling again.

Real.

Behind me, the wings shifted slightly, reacting to the movement without conscious effort.

Still inefficient.

That would need to change.

I stood again and turned away from the pool. Appearance confirmed. No further value in observation.

The cave remained quiet.

Too quiet.

Something felt wrong—not immediate danger, not something I could define clearly, just a constant pressure in the air, like the space itself wasn't entirely stable.

I stopped.

There it was again.

Not a sound.

A presence.

Faint, distant… but massive.

I didn't move.

Didn't react.

Just focused.

Whatever it was, it wasn't close. The distance between us was significant, but the scale of it made that distance feel irrelevant.

It wasn't something small.

It wasn't something normal.

"…Understood."

Conclusion:

This was not an isolated environment.

I turned slightly, adjusting my direction.

Not toward it.

Not yet.

There was no reason to approach something I didn't understand.

Instead, I continued forward, mapping what I could, noting the structure of the cave, the consistency of the ground, the patterns in the air.

Step by step.

The wings adjusted behind me, more responsive now than before.

Better.

For now, survival was simple.

Move.

Observe.

Avoid unnecessary risk.

Understanding could come later.

Still…

That presence remained.

Distant.

Unmoving.

Watching.

I didn't look back, there was no need.