Benadam le Nefesh (with an ""L"") died, but Death made a mistake and instead claimed Benadam Ie Nefesh (with an 'i'). So the former is offered the chance to replace the latter, living on in his body and world. The catch is that Death's mix-up is not without consequences, such as the potential for a ""small"" apocalypse. Benadam role is to deal with the effects of what happened, unless he wants to meet a rather more permanent end.