Bayron City, a pioneering metropolis built on a newly discovered energy source, promises every citizen a luxurious and comfortable lifestyle. In reality, young demon exterminator Shuu Ogata's life is far from extravagant. Despite running a private military business, he often struggles to make ends meet due to reckless expenses. Fortunately, Kisara, his demon partner, is more than eager to help Shuu with household matters—albeit a little too forcefully for his comfort. The two work side by side, taking countermeasures against demon hazards, which stand as the biggest threats to the city. With danger lurking in the shadows, Shuu and Kisara strive to grant the town's safety; however, exterminating the possessed comes with a price unbeknownst to others.

Floating in a certain ocean is an island called "EGU Island." The sole entertainment on this island is listening to the songstress, "End of the World." Day after day, the islanders are enchanted by her singing. However, this tranquil time is shattered in an instant. Since the disappearance of the songstress, the island has been filled with "anger," "doubt," and "anxiety." Various thoughts and intentions begin to stir...A licking war unfolds around, "End of the World!" The one who holds her destiny is the legendary legacy "EGUMI Legacy." (Source: Ani-One Asia)

Leo is a boy genius inventor. Aquro is a water type Elemon (H2O) created by Leo. Elemon are creatures born from the Elemon Blender. They are mysterious beings with the power of the elements! "ELEMON" opens up an exciting world of science and adventure, anchored by the friendship of Leo and Aquro as they explore an entire universe of unique Elemon! (Source: Toei Animation)