The second movie of Sora no Otoshimono that concludes the anime series.

Three months have passed since the Demon King was defeated by a hero. Mankind rejoices over their victory, but dwellers of the demon world do not share the same sentiment. With the loss of their king, they must now hold a tournament to decide who will become his successor. Monitoring the competition is the hot-headed yet powerful Vamirio—one of the Four Heavenly Kings. Among all the participants, she is extremely distrustful of one: Helck, a human hero who claims to hate humanity. As much as she wants to get rid of him, it is impossible due to Helck's incredible strength and popularity. Amidst the competition, Vamirio discovers that humans have vanished from various towns. As a result of this puzzling turn of events, Vamirio grows desperate to reveal Helck's true intentions by carefully crafting a plan to make Helck lose. If she proves to be successful, she might uncover where his loyalty truly lies before the demon world is endangered.

When ordinary boy Kagami Kazuya meets the beautiful tsukumogami Kiriha, his life gets turned upside-down. As a Taboo Child who draws the supernatural towards him, he receives orders from the God of the Land, Kukuri, to become an exorcist and defeat these evil forces. And so, he and Kiriha do battle. To find out information on these supernatural beings, Kazuya and his friends set up a counselor's club at school. But behind the typical-seeming troubles he hears about, he uncovers a major plot to target Kukuri... In addition to the sadistic-yet-beautiful tsukumogami Kiriha, the situation draws other girls to Kazuya to join the fray! (Source: Crunchyroll)

Following the most recent brutal battle, the gods now hold the lead against mortals in the one-on-one tournament that will decide the fate of humanity. With three wins under the belt of the divine beings, the humans only have 10 matches left to save themselves from extermination. The Supreme God Zeus intends to take the upper hand by sending Buddha—a benevolent demigod loved by all of humanity—into the fray. In a shocking twist, Buddha announces his intention to fight for humanity. Enraged by this betrayal, the gods call upon the Seven Gods of Fortune to take Buddha down. As their battle rages on, a mysterious entity manifests in the middle of the arena, throwing the entire competition into disarray.