Betrayal: Become strong in another world

When tanjiro was walking with his sister in the box on his back.After being betrayd by the demon slayer corps.By doing something that he did not do wen he was walking suddenly a gate open and took him in a another world.

After so many years in a another world with his sister they become strong by countless battles,Betrayal, assassination.

Tanjiro is now 23 and nezuko is 21

Tanjiro thought:I've been in this world for 8 years but I would never thought that we will go back to our world with my sister nezuko and me we've become strong in these years.