Logan Stark. the famed Iron Lad, the next Iron Man, dies using the Infinity Stones. Now transported back to the Taisho era, but not his own. He is in a alternate universe, where demons prowl in the dark hunting human to eat. Now armed with the Infinity Stones, Logan will join the ranks of the Demon Slayer Corps. He will slay demons and avenge those killed by demons. M for gore.

When Nezuko was reborn, this was not what she was expecting. (Or, when Nezuko gets dragged into the Avengers via her uncle.)