Breathing techniques are a Demon Slayers' secret weapon in their fight against Demons. But what if Demons could use them too?

Demon Slayer fans who have yet to read the manga and have only seen the anime often ask "Why did Jigoro Kuwajima commit seppuku?".

The Demon Slayer Corps stands as humanity's only defense against Demons. But what would have happened if it never existed?

Demon Slayer is full of inspiring advice, but Tanjiro Kamado is an especially excellent source of valuable life lessons.