Before I forget, imagine office worker Nanami being forced to go to some social-work function where his company is getting tax write-offs by donating to a museum and somehow, Nanami Haruhi-from-OHSHC's his way into accidentally breaking an ancient vase rumored to hold the curses of a thousand sins in it
By unleashing all the curses, he also unleashes the 1000th curse locked in the vase itself - a being who calls himself Satoru Gojo who had been holding all the curses in check himself all that time. And boy is he glad to be out because of itty bitty living space and MASS UNIVERSAL POWER will give you SUCH A CRICK IN THE NECK-
Anyways, he imprints on Nanami. Oops, Nanami now has to collect and/or destroy all the old curses released onto the world with THE most annoying beautiful creature he's ever encountered in his life or else the whole world goes kaboom
It would probably be a lot easier though if Gojo told him everything though. He seems to be hiding his past with that long-haired monk with the weird bangs that came out of the vase with him...
And that King of Curses' character needs to put on a goddamn shirt already, isn't he cold?