The Weakest Junior Sister? Demon Lord Kneels Down and Begs Me to Return to My Throne!

I dressed up as the most useless little junior sister in the Immortal Sect. Every day he was either disliked by his fellow disciples or bullied by the outermost disciples. Until the day of the Immortal Gate Competition came, the Demon Lord led thousands of demons to attack the Immortal Gate Queen. Just when everyone thought we were doomed, the arrogant Demon Lord suddenly knelt in front of me: "I'm late, please return to your seat."