Professor Ochanomizu closely monitors Atom’s erratic behavior. Dr. Tenma confronts his past and the truth unravels, triggering a world destroying threat.

Another horned corpse is found. Gesicht reaches out to Atom, the most advanced of the seven robots, to help analyze the serial murders.

Ganta and Isaki have experienced lonely nights as they each struggle with sleeplessness. They form a “Nightly Fun Society” using the observatory as a secret base.

On a cloudy seaside class trip, Isaki makes a promise with Ganta to meet on the beach under the starry sky if the weather clears up.

Despite starting a part-time job, Ganta hasn’t raised enough money for training camp. But thanks to Isaki staying at her grandmother’s house, their problems are solved.