Virus Tensei kara Isekai Kansen Monogatari

I was supposed to be dead, but when I woke up, I was a rat! ...or, more accurately, I became a virus and infested a rat!! The more I infect, the more bodies and skills I get! I'm going to cause a pandemic in this other world! Web Novel (Japanese): https://ncode.syosetu.com/n9004es/