Demon Princess Magical Chaos

Death and Reincarnation.

Kuroe Makoto, the tomboyish ace of her high school track and field club, never spared a thought for these things before. However, when she falls asleep in her Tokyo home after an exhausting marathon and wakes up in a fantasy world, those concepts become her reality. And unlike in the common light novel setting, she isn't reincarnated as the naturally good-looking and talented human hero who gathers a harem effortlessly.

In fact, she isn't reincarnated as a human at all. She is reborn as 'Chaos', child of the demon queen and heir to a kingdom at war with humanity.

Maou Shoujo Magical Chaos puts the Japanese high school girl in a tentacle monster, in this strange tale of a sound human mind possessing a horrifying creature's body. Join Chaos on her oftentimes humorous but also perilous journey through a world of sword and sorcery, as she discovers a newfound appetite for life, terror, and rare species.
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Disclaimer: The entire rewritten series is available in digital and print formats on Amazon and in audio book format on Podium Entertainment! It has a lot more story, brand new characters, and a different ending, so don't miss the definitive version of Chaos!