The aim of the paper is to investigate the work HERA about a fantasy-style adventurous story, created as a 3D ARPG game. HERA implies “creation.” The adventurous story describes a prosperous island nation where tons of fantastic creatures and cultures are created and at the same time light and darkness occur. The gamer acts as the son of the island nation, Finbul (芬布爾). The story focuses on two knives, a sign of power, which stand for light and brightness respectively. As such, characters’ end justifies their means in the game. The relationship among gamers in the story is addressed through the internal narrator—the protagonist. The creation team hopes that the role play in the HERA can allow gamers to enjoy its entertainment and pay attention to the narrator’s story through the special effects and suspense narration in the game. The research study reveals the creating process through the understanding of the fantasy-style adventurous game, and offers relevant suggestions after data analysis that focuses on the imagination of its plots, the design of barriers, the design of the characters’ scenes, the production of the view-finding and photography-employing effects, the design of the characters’ acts, and so forth. Also, through the careful and deep investigation, the study offers suggestions which can make the creation of a game more story-like and dramatic, and thereby provides concrete strategies to improve the quality of game works.