Demon Slayer: I'll Save My Senior Sister

Reborn into the world of Demon Slayer at twelve, Zhou Yi binds to the Swordsman System. He masters Water Breathing in a single day and clears Mount Fujikasane in seven. Just as Makomo is about to step into a fatal trap, Zhou Yi stands before her with his blade raised. "I have slain every demon on this mountain. I'll clear the way for you, Senior Sister." As the Hand Demon turns to ash, the System announces: Redemption +100%. Unlocked: Muzan-killing module.