A little orphan girl Momo lives in ruins, gifted with exceptional listening skills, making friends. She notices something amiss, uncovering the Grey Lords, a secret society manipulating people to save time for their nefarious ends.

Momo, a little orphan girl, lives in the ruins of an old amphitheater in a small town. Her extraordinary ability to listen draws people to her and she has many wonderful friends. One day she becomes aware that something has changed. Looking further into this, she comes across the "Grey Lords", a powerful secret organization that is aggressively influencing people to save time and give it to them.