I Have Become a Rat, So Naturally I Must Spread The Black Death. Black Rat

Brady is a 41 year old employee at an app development company who hates his life, he hates his boss, his house, his wife, himself and public performers.

Then one day as he’s going to work an accident happens leading to his death, he then gets reincarnated as a rat in a fantasy world due to his foul improper life.

He soon discovers the rat community in his black death-stricken world and their trials and decides to enact his revenge on the humans he hates the most. But as a rat....what can he do?