후작가의 역대급 막내아들

あらすじ

After getting revenge on the Thulcaan Empire, Jack Valantier took his last breath. But just when he thinks it's all over, he finds himself transported back to when he was 14! From his negligent and wicked family to his loyal servant and caring sister, it's all just as he had remembered. But this time, Jack is armed to the teeth with decades of experience from his previous life! He's ready to give them hell, and those that have wronged him will pay dearly. Because this time, he's invincible.