Virus Tensei kara Isekai Kansen MonogatariVirus Tensei kara Hajimaru Isekai Kansen Monogatari; ウイルス転生から始まる異世界感染物語; The Otherworldly Infection Story that Started with a Virus Reincarnation; It’s That Reincarnated-as-a-Virus Story
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!