Royal Guard Captain Brian has been bested, and Princess Remiphinia has been rescued. With that battle behind them, Liz and her friends return to Academy Town. But a new threat lies in wait—a mysterious masked figure wielding another holy sword, who ambushes the party. Though injured, Cain manages to fend off this fearsome foe, only for the figure to seize the opportunity to abduct Liz.

Whisked away to a mysterious hideout, Liz finally learns the true identity of her captor, who claims to be a hero, except that he—no, she is a beautiful cat girl! This new hero, Dia, claims that her holy sword is the real one, while the sword the current hero Cain wields is but an imitation. She thus declares that there is no need for two divine heroes in this world. But what might she do to see this proclamation through?