an explanation on what this au is

Mondo is convinced he doesn't have a soulmate considering his birthday is months past and still no signal of a soulmate, that is till he wakes up one day in the body of his rival Kiyotaka Ishimaru! Mondo is extremely confused on why he's "him" but he must presume as normal, as for Ishimaru he is in complete shock mainly since he'd never expect them to bond so he'd be stuck that way forever he didn't want to make a new life! Plus how would he tell his father who is a POLICE OFFICER that his soulmate is a famous BIKER! Plus they have to deal with school and social lives, I guess they'll have to figure out how to cooperate and bond so they can get back to normal!