How To Live As A Tyrant's Spoiled Brat

the day the empire fell to rebellion and otherworldly erosion. the protagonist valen meets his death alongside his younger sister the empress and returns 40 years into the past. this time he vows to live diligently prevent the destruction of the world and protect the empress ! to achieve this the path he chooses is… living even more recklessly than in his previous life. if he was a scoundrel in his past life, this time he'll live as the worst scoundrel the world has ever seen!