Katsuki Bakugou is remarked to be one of the best tamers around— whether it's hybrids or mythical creatures he earns his money off of; they always end up obedient.

Meanwhile, Izuku is a 'stray',a dog hybrid between half human and half a dog, homeless— thrown out by his old caretakers,which is most likely illegal to do,anyway.

As Katsuki was heading back to his apartament after going grocery shopping,he encounters sight of the hybrid in an alley.