A change in heart

"I'm...sorry for all of the trouble that I've caused. I know I can't bring back the people I've killed or made suffer, but I would like to atone for my crimes by offering my assistance up to the Demon Slayer Corps," Rui said in a hesitant tone, fully knowing the price he's going to pay for betraying his kind.

There is a special type of brand traitors get when they decide to betray Muzan. Rui Ayaki, former lower moon five, is one of these traitors.

After unlocking his memories and coming to a startling realization, Rui betrayed Muzan and joined the Demon Slayer Corps in hopes of finding a way to take down Muzan once and for all. Little did Rui know, things were about to get a whole lot more dangerous...