Demon Slayer ... Kaigaku doesn’t understand the concept of honor. When he sees the kind nature of Zenitsu, it infuriates him. He can’t grasp the idea of another human who wants to chase power.

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

However, later on in the series, Zentisu's power ... Kaigaku chose to become a demon because he was obsessed with becoming stronger. He chose to become a demon over death and betrayed the Demon ...

Jigoro Kuwajima was the retired Thunder Hashira, and took both Zenitsu and Kaigaku under his wing to train them to become the ...