The Cage of Emotions

To save his pet cat, the protagonist Zero is forced to search for the legendary “Core of Original Emotion.”

Working with the information broker Messiah, he sneaks from the Lower City into the Upper City and meets Lilith, the ruler’s daughter.

During the mission, Zero discovers that he is the ruler’s biological son, the Chief Tuner, and a failed experiment. He also learns that the entire world is built on a huge lie.

Zero refuses to become his father’s successor. Instead, he chooses to release his emotions, detonating the “Resonance Core” that maintains order in the world.

The old order collapses, and the world falls into chaos, but regains its “freedom of emotion.” Having reclaimed his identity and humanity, the protagonist faces an uncertain future alongside his companions.