Oragon hails from the Monster World, proclaiming himself its Prince. He enters the human world via a smartphone application, summoned by the protagonist Ren after the Monster Strike game appeared mysteriously on Ren's device. His stated aim is to gain strength and experience in the human world, yet his royal claims are frequently doubted. Others often perceive him merely as a program within the game, not an actual prince from another dimension. This conflict between his asserted identity and others' perceptions is a consistent element of his character.

Within the narrative of Monster Strike: Mermaid Rhapsody, Oragon participates as Ren and friends travel to Okinawa during summer break, following Minami's father, a former mercenary invited to an American naval party. On the beach, Ren encounters a mysterious girl pleading for help before she vanishes. Oragon becomes involved in Ren's ensuing mission to uncover her identity and the meaning behind her plea, supporting him throughout this investigation. These events occur specifically between Episode 35 and 36 of the main Monster Strike anime series.

Oragon's role extends beyond this special episode. He appears as a summoned monster partner throughout the main Monster Strike anime series, multiple original net animations (ONAs), and theatrical films. His presence consistently ties to Ren's activities and the broader conflicts involving monsters manifesting in the real world and the mysteries surrounding the Monster Strike game. Across all these appearances, his background as the self-proclaimed prince of the Monster World and his connection to Ren via the smartphone summoning mechanism remain unchanged.