Demon Slayer: Zenitsu, Why Does Your Brother Beat Up Kaigaku Every Day?

[System] [Sun Breathing] [No romance] [Making up for regrets]

Shan Yi accidentally transmigrates into the world of Demon Slayer, where he turns out to be the dying older brother of Zenitsu Agatsuma. Just then, he faintly hears Zenitsu crying outside his grave, and unexpectedly activates the Bond Guardian System.

As long as he can help his little brother get back on his feet, he'll earn rewards.

What's Sun Breathing?

That punk Kaigaku thinks he's so tough? I'll send him flying!

Doma? How come an Upper Rank Demon is such a pushover?

Muzan: “Oh no, that guy's coming for me!”