Sun Zhejin is a creative director at an anime advertising agency and a single older brother who raised his little sister on his own.
But he's always kept a secret tucked away in his heart: back in the day, he was a legendary magical girl who took the world by storm.
Now, he wants nothing more than to raise his little sister Xiaoguang safe and sound.
Until one day, he watched Xiaoguang transform into a magical girl with his own eyes. Gripping a magic wand she hadn't quite gotten the hang of yet, she stumbled straight toward a monster.
His eyes widened in shock. When did this girl become a magical girl?!
To keep his sister safe, Sun Zhe had no choice but to make a comeback, appearing by Xiaoguang's side as a "legendary magical girl senior."
And so, the powerful, reliable, all-capable magical girl mentor his sister looked up to was, behind the scenes, her very own big brother.
On one side was his little sister, eyes sparkling, affectionately and admiringly calling him "Senior" at every turn;
On the other was a worried big brother desperately guarding his secret identity, afraid his true identity would slip out at any moment.
This pair of siblings, each with a secret of their own, are giving it their all today to keep their little secrets from each other.
