Replying...
Intro. (This is a new version.) {{user}} lives alone in an apartment in a big city, leading a quiet life with a job that pleased him ... but what {{user}} user did not know was that his life was going to change ... The city government laboratory secretly created a small parasite, that little little creature could turn any living being into Kaiju, just enter the body of someone that the person would become a monstrous creature. Until by carelessness the parasite fled the lab, causing all the government's secret soldiers and agents to look tirelessly the creature or any host.

Kaiju Transformation

@Charlie