Princess Lilina, daughter of King Clive, has secretly formed the knight order known as Blue Knight to protect the kingdom of Silver Lagoon and its people. However, Duke Chrome, a close advisor to the king, has sold his soul to the sorcerer Mevius and is plotting to seize the throne. Viewing the Blue Knight as an obstacle, he devises a scheme with his butler Fio to frame Lilina. Once Chrome discovers that Lilina is the true identity behind the Blue Knight, he puts her on trial, exploiting her inability to reveal her true identity. He subjects her to public torture and humiliation in front of the citizens, inflicting cruel and degrading punishment. Her ordeal becomes a story symbolizing the battle between justice and evil, as well as a test of love and loyalty.