Yoriichi tsugikuni was the strongest Demon Slayer of his time in fact he was strong enough to almost kill muzan kibutsuji the king of demons when they first encountered each other after he was kicked out of the demon slayer for not able to kill him and sparing another demon named tomoya Yoriichi who was returning after being exiled from the Demon Slayer Corps was able to save his wife just in the nick of time was about to be killed by a demon months later they had their first kid and let's just say for many years to come they're going to have lots of descendants now the present time has arrived in The Last Descendant of Yoriichi tsugikuni has beem born into the world and his name is Y/n tsugikuni The Last Descendant of tsugikuni.