Yuno Gasai lives a normal life as a first-year in high school. She gets along well with her parents and even has a small circle of friends. However, she cannot help but feel as if someone is missing from her life, someone so important to her that it was as if she had lived another life trying desperately to stay with them. After a class trip to the beach, Yuno returns home; but in the middle of the night, she receives strange messages from a voice only she can hear. The voice informs her of the person she is desperate to meet and that she must find him. Soon, she finds herself in a mysterious realm, her only goal being reunited with the person she cannot remember. Though obstacles stand in her way, Yuno will stop at nothing to meet her beloved once again.

Prior to the events of the anime, three factions—the Garan Army, the Kiba Army, and the Aira Army, battle for total dominance of Machine Island. The island is basically a prison, isolated from the rest of the world. The island contains a vast amount of resources, allowing the three factions to create an infinite supply of giant robots for their respective armies. The world government learns that the island's power reactor has become unstable and will explode within 66 hours, destroying all of life and Earth itself. The government sends the Death Caprice squad, composed of mercenaries Ken Kaido and Ryo Magami to solve the issue, along with their giant robot Mazinkaiser, but was that a good idea?

Kanon spin-off OVA bundled with vol. 22 of the Kami nomi zo Shiru Sekai manga.

An anthology series adapting 8 short stories created by manga artist Tatsuki Fujimoto between ages 17 and 26. 1) A Couple Clucking Chickens Were Still Kickin' in the Schoolyard (Seishirou Nagaya, ZEXCS) 2) Sasaki Stopped a Bullet (Nobukage Kimura, Lapin Track) 3) Love is Blind (Nobuyuki Takeuchi, Lapin Track) 4) Shikaku (Naoya Ando, GRAPH77) 5) Mermaid Rhapsody (Tetsuaki Watanabe, 100Studio) 6) Woke-Up-as-a-Girl Syndrome (Kazuaki Terasawa, Studio Kafka) 7) Nayuta of the Prophecy (Tetsuaki Watanabe, 100Studio) 8) Sisters (Osamu Honma, P.A.WORKS)