Legina B. Alpere, the one and only princess of the Ellias Empire. She lost everyone dear to her and the empire itself due to the rebellion of her fiancé, Duke Slyveig. She fought with her sword until her last breath, ultimately sacrificing her own life. However, when she woke up, she had regressed to a time when everyone was still safe.

The root cause of the empire’s downfall was the awakening of her younger brother, Theore, the only troublemaker among the imperial family. Due to a series of incidents, he suddenly transformed from a troublemaker into a pushover, which allowed the empire to fall into the hands of a traitor.

To prevent the same events from repeating, she must stop Theore from becoming a pushover! But she can’t just leave him as an incompetent troublemaker either. She has no choice but to help him grow into a proper troublemaker who can become a respectable next emperor. To do this, she must also prevent the current emperor’s early death and divert the attention of the nobles who praise her over her younger brother.

So what’s she to do? She has no choice but to become an even bigger troublemaker than Theore!