They Stole My SSS-Rank Class from the Start? I Awakened the World's Shield Instead!

Prologue

At the class-change platform, the girlfriend I'd been dating for three years ripped out my heart with her own hands. No, it wasn't a heart. It was the source of the SSS-rank class [Flame Dragon Mage], which had just awakened within me and blazed with dazzling light. Like an offering at a sacrifice, she presented it to the City Lord's son, who had publicly humiliated me.

Amid the derisive laughter all around, I accepted the handout-like C-rank [Shield Guard] class card. I smiled. They had no idea that beneath this humiliating C-rank lay my true divine throne.

[Ding! Would you like to change class to the unique hidden SSS-rank class, World Shield?]

Flame Dragon Mage? Is it really that strong? My