The world is in peril and fate needs a hero to save it. Sometimes all fate gets is a bunny. She is a dungeon creature bound by the rules of the dungeon. Her job is to do bunny things, like eat and hop, and eventually fall prey to larger creatures. A bunny need do nothing more. However, she cannot help herself. Everyday as adventurers pass through the cave that she calls home, she sees them wielding strange and fascinating magic but more importantly hears them talking. Their words are wonderful, and she learns as many as she can while trying to ignore the epic tragedy of her life. She is just a bunny, and there is no way that a bunny could ever be like an adventurer, no matter how many words she knows.

The life of an Infant Demon is a bloody grind to the top. For Salvos, a curious newborn Demon with a penchant for making friends, surviving the swarms of wild Demons in the Netherworld was always going to be a difficult task. She will adapt, gain experience, and evolve to survive this hellish landscape with the help of her sole companion.

But when her companion's life is threatened by a mysterious Demon King, she'll have to do what it takes to save him. Even if it means separating from him and being tossed into an unfamiliar world with Humans, monsters, and a bright blue sky where she is scorned for being born a Demon.

The law of evolution is survival of the fittest, and Salvos will survive.