Toaru Majutsu no Index: Genesis Testament - Volume 4, Chapter 3: The Counterattack Begins – Boy_not_“Dark”.

“Six-legged black, red worm, level seven elite worm beast. After absorbing it, I should be able to reach the eighth level.”The Giant Exploding Thunder Dragon beast, with bronze blood, is as big as an asteroid. If I absorb it, I can reach the black hole level immediately!Chaos White Liexiang, the best of chaotic spirit beasts. Difficult to take care of, but as long as I absorb it, my life index can break 10000!Wang Xu accidentally got a flame that could devour insects and beasts and convert their energy into his own. From then on, no one could stand in his way!

Kazuki’s life was painfully average—just another cog in the nine-to-five grind. His only escape? Binge-reading novels and no-lifing video games.Then he woke up inside one of those novels.Armed with unstable morals, unhinged humor, and a penchant for pettiness, Kazuki is determined to survive, thrive, and maybe cause a little chaos along the way.The world has no idea what’s coming.

I seem to have reincarnated in the world of an r-rated romance fantasy novel. And not just as an ordinary character, but as the witch who loses her life to the crazy male lead!

Luckily there is a long 200 years until the main characters are born and grow into their roles.

Now that my life is not in imminent danger, shall we leisurely think of ways to avoid death?

However, I had not taken notice of a very important detail about the time I’d be spending ‘safe from imminent danger’. 200 years was by no means a short waiting period and by the time the younger version of the male lead appeared in front of me , I had completely forgotten the original novel’s plot!

Oh, whatever, now that it’s come to this, the only way to survive is to raise the male lead into a sane and stable adult! The first step to avoiding death by the hands of the tyrant male lead is changing this extremely frightened child’s life.

“It must be very inconvenient for you to have me suddenly show up on your doorstep, I’m sorry. You can tell me to go away, I’ll be fine.”

“Nonsense. Do I look like someone who could be inconvenienced by a little boy like you? Also, what do you mean by you’ll be fine even if told to go away? It’s not like you have anywhere to go back to, kid.”

The little boy burst into tears.

‘Oh, this is so not it.’ Was what the witch thought to herself as the little boy sobbed

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates