The Otherworldly Infection Story that Started with a Virus Reincarnation

Chapter 3.1
Chapter 2.2
Chapter 3.2
Chapter 2.2
Chapter 3.2
I was supposed to be dead, but when I woke up, I was a rat! or, more accurately, I became a virus-infested rat!! The more I infect, the more bodies and skills I get! I'm going to cause a pandemic in this other world!