The klyntar race has been bonding with host on other planets to enact peace and prosperity to it and a new klyntar has come to bond with a human on the planet earth but it ended up with a hero in Japan by the name instinct and as this person bonded with the symbiote they rised up to become one of the number 5 hero because of his qurik dealing with him having enhanced sense's and with the help of the symbiote it had boosted to the likes of Spiderman's spider Sense and with the all the boost it came with a price feeding the symbiote with brains and as he continues this he does some research that shows that their is some candy bars that can provide those nutrients that it needs and filled with regret and remorse he let the symbiote go and he ended up killing himself and when the symbiote try's to find a new host it finds an almost dead boy that is izuku Midoriya