"RPG Densetsu Hepoi" is a fantasy-comedy anime that parodies traditional role-playing game tropes while weaving a lighthearted narrative. The story centers on Hepoi, a young and naive adventurer who dreams of becoming a legendary hero. Hepoi's journey begins when he is tasked with defeating the Demon King, a classic RPG antagonist threatening the world. Along the way, he forms a party with a diverse group of companions, each embodying familiar RPG archetypes: a stoic warrior, a mischievous thief, a wise mage, and a cheerful healer.

The series humorously subverts expectations by highlighting the absurdities and clichés of RPG mechanics. Hepoi often struggles with the mundane realities of adventuring, such as managing limited resources, dealing with repetitive quests, and navigating the often illogical behavior of NPCs. The Demon King, rather than being a fearsome villain, is portrayed as a bumbling yet oddly sympathetic figure, adding a layer of comedic irony to the narrative.

As the party progresses, they encounter a variety of episodic challenges, including battling monsters, solving puzzles, and interacting with quirky townsfolk. These encounters are frequently punctuated by fourth-wall-breaking humor and meta-commentary on gaming conventions. Despite the comedic tone, the series occasionally delves into themes of friendship, perseverance, and the value of teamwork, as Hepoi and his companions grow closer through their shared experiences.

The anime's episodic structure allows for a mix of self-contained stories and overarching plotlines, with the ultimate goal of confronting the Demon King serving as a narrative anchor. While the series primarily focuses on humor, it also incorporates moments of genuine character development, particularly as Hepoi matures from an overeager novice into a more capable and thoughtful leader. The interplay between the characters, combined with the satirical take on RPG conventions, makes "RPG Densetsu Hepoi" a distinctive entry in the fantasy-comedy genre.