Global Evolution: It All Starts with a Transformation Device

(This is a new book, so the rating might be a bit low. I hope you all enjoy it.)

"Others transmigrate and become overpowered protagonists, but I transmigrated and became a rookie policeman's...transformation device?" Fine, a device spirit it is, at least I can design cool armor. But my first partner is too reckless, daring to investigate an evolved monster that can tear armor apart with its bare hands! Help! The host is going to die! What happened to saving the world? System, can I give this a bad review?!