Demon Slayer: From the Start, I Was Muzan, and the System Wants Me to Revive the Demons

[System]+ [Invincible]+ [Farming]+ [Unexpected Contrast] I’d just transmigrated into the body of Demon King Muzan and hadn’t even had time to throw my weight around when the “Strongest Demon Clan System” bound itself to me! [Ding! Main quest issued: Restore the demon clan to glory!] [Beginner quest: Punish evil demons and establish standards for demon behavior.] [Side quest: Develop edible blood packs to reduce harm to humans.] Me: “?” System, something’s off about you! I’m the villainous final boss!