An OVA based on the Hoshi no Umi arc of the manga spanning chapters 26-34. This arc focuses on Rin Azuma, a Jiang-Shi yokai resident of Sakurashin adjusting to her new life in the city and working for a ramen shop. One day her former friend Zakuro Kurumaki invades Sakurashin to capture Rin and convince her to join her in destroying the city with the other yokai hunters as well as Enjin Hiizumi, the main antagonist of the series. Akina Hiizumi and the other members of the Hiizumi Life Counseling Office take action to save Rin, 'tune' the yokai controlling Zakuro and protect the city. (Source: ANN)

Devilman features Akira Fudo, a shy and timid teenager who has gone mountain climbing in the Himalayas with his father. While in the middle of the expedition, both father and son are killed in a tragic accident. Akira's body is found and possessed by the demon soldier Devilman, who uses his new human form as a disguise in order to fulfill his mission of causing chaos on Earth in order to pave the way for a demonic invasion of the planet. Before his mission can begin in earnest, Devilman meets Akira's childhood friend Miki Makimura and quickly falls in love with her. Devilman resolves to protect Miki and humanity as a whole by battling against his fellow demons. Demon Tribe leader Zennon becomes greatly angered at Devilman's betrayal and is quick to send Devilman's former comrades to destroy him. The other demons soon learn that Miki is precious to Devilman and he must now work to protect her, as well as protect himself. Will the power of love be able to overcome that of true evil?

After a desperate battle and many losses, humans finally slay Godzilla—the monster that caused humanity to flee Earth 20 thousand years prior. But the creature Haruo Sakaki's troops killed was not alone; there existed another Godzilla on Earth yet to be defeated. Grievously wounded from the first conflict, Sakaki wakes up in the home of a young girl who is a member of the Houtua tribe. Bearing a shocking resemblance to humans, the Houtua have adapted to survive the changed climate of the planet that had long been abandoned. With most of their resources depleted, the remaining members of Sasaki's special forces struggle with the decision to abandon their mission and their home planet or to fight an improbable battle. Hope is not completely lost however, as the members from the Bilusaludo race of aliens discover remnants of their anti-Godzilla weapon Mechagodzilla. Even with this powerful weapon in their arsenal, victory seems impossible to grasp: Godzilla has spent all this time evolving and preparing to defeat anyone who dares to challenge its superiority.

Long before the era of prehistoric man, an advanced alien species inhabited Earth. Negligent of the power they held, these beings ultimately caused their own demise. However, the aliens left behind a warning to future civilizations on indestructible tablets: to destroy any remains of the ruinous technology created by their kind. In modern times, the ARCAM Corporation and their paramilitary unit—the Spriggans—seek to seal the relics away and prevent renegade actors from exploiting their powers. Following ARCAM's recent discovery in the Ararat Mountains of what is believed to be the mythic Noah's Ark, Spriggan Yuu Ominae has been dispatched to investigate. However, the site is ambushed by the US Machine Corps—a radical faction of the Department of Defense led by Colonel MacDougall. On the Pentagon's orders, MacDougall seeks to secure ARCAM's lead scientist and seize the artifact. Teamed up with fellow Spriggan Jean Jacquemondo, Yuu must stop MacDougall and the Machine Corps' elite soldiers from advancing on the Ark before it is too late.