Monsters! A meteor is about to hit Earth! Fortunately, it's not very big.
Monsters! There are alien creatures inside the meteor! Fortunately, the scientists caught them.
Monsters! The scientists are asking for trouble! Fortunately... Wait, what do you mean, fortunately? The containment facility failed, and the monsters have all escaped into Tokyo!
This is the story of a protagonist who transmigrates as an alien creature and what happens in Tokyo. It leans slightly serious, but the protagonist won't suffer.
The protagonist has a strong moral compass and is chaotic good. The heroines are generally very intelligent, and there's a wide variety of them, but this isn't a harem novel (a female scientist, a renowned female kendo practitioner, a high school girl, a younger sister, a niece...).
Also, this book is really about fighting. I'm serious: this story isn't lewd.
