Naruto: Reduce All Creation to Ash

Kaen Tsurugi died. He doesn't even know how he died, just that he died. He also didn't meet an all-powerful being that guides lost souls to reincarnate for their own amusement either. He thought he got reborn in the past, but that notion was crushed the moment he saw someone running on a wall. Or all the people with ninja headbands. "Sh*t. At least I got a system though. Inventory!... Inventory?... Status? Skills?... Sh*t." Disclaimer: I don't own Naruto or Bleach.