The Kezumu were not exactly cohesive, historically. Indeed, before the First Shinobi World War, each person that later identified as such had no idea there were others of their ilk. Due to the nature of the chakra of those now known as the Kezumu, within the Shinobi nations after the first war, there were rumours that circulated, piquing the intrigue of those that felt relations to those rumours. Shinobi that felt vile to the sensory lookouts, and that seemed to curse all that they touched. Relating to the rumours, for they felt scorn from their allies that deemed them unpleasant as well, and wicked, many began listening out for more rumours.

As the Second Shinobi World War started, the rumours returned, and the, now interested, afflicted took notice, hearing even more rumours of those akin to themselves being sighted and reported in other nations, and even on their own side. Feeling desperate to cling to whatever sense of normality they could, many shinobi left their home villages to meet with others of their ilk. An act that could be deemed the greatest mistake of the soon to be clan, the Kezumu.

As so many of the shinobi that had begun looking for others of their kind began leaving unannounced, the shinobi villages began to scorn them, deeming the people traitors and missing ninja. The tensions that led to the Third Shinobi World War however, allowed the fleeing shinobi to fade into distant memory, the conflict being deemed far more important than what each village assumed was just a small collection of thugs that had a bad attitude, and a bad atmosphere about them. Yet, wounded that they were so quickly forgotten, the Kezumu that gathered together found themselves bonding over finding others that were scorned like they each individually were, and in a fit of mutual rage, set out as mercenaries, aiding in the Third Shinobi World War for any side that would pay them, and against any side that wouldn’t.

Their reputation rose once more, and through history, the clan remained a mystery that kept popping up as mercenaries, aiding in wars as the secret villains, and then fading out again, and even when it was around, and clan members were spotted, or sensed due to their vile chakra, the clan members themselves seemed to have no recollection. As if the clan itself seemed to stop existing every now and again, thus leading to the common name of the clan, the Kezumu – for they always faded away into nothing, and so too did their enemies.

However, one major incident impacted the non-existent clan, and indeed, the whole shinobi world, more than any of the wars had impacted the clan. While many clan members were working on a mission for Kirigakure no Sato, the village burned down to the ground by the black flames of Ameterasu. Many villagers knew instantly what it meant, yet others deemed it bad luck, caused entirely by the presence of the Kezumu. The shinobi of Kirigakure hunted the Kezumu, deeming the entire clan Missing Ninja, and once more, as always, the Kezumu faded out of history, and into nothingness.