Yuno is so annoying.
A deathmatch to find out who killed the Demon King? How the hell does that make any sense? Is there a prophecy of some sort that's going to say the hero will be the strongest? Idiot logic to believe the strongest absolutely has to be the one who killed him. Even dumber if they're looking for a fake hero to act as the one who killed him and are advertising this tournament to the world, which seems to be the case since Yuno knows about it.
Looks a Valkyrie ripoff with so-far stupid storyline.