Phantasy Star is a role-playing video game (RPG) developed by Sega and released for the Master System in 1987. One of the earliest Japanese RPGs for consoles, Phantasy Star tells the story of Alis on her journey to defeat the evil ruler of her star system, King Lassic, after her brother dies at his hands. She traverses between planets, gathering a party of fighters and collecting the items she needs to avenge her brother's death and return peace to the star system. The gameplay features traditional Japanese RPG elements including random encounters and experience points. All the characters have predefined personalities and abilities, a unique element compared to the customizable characters of other RPGs of the era.

A role-playing video game, a role-playing game (RPG) or computer role-playing game (CRPG), is a video game genre where the player controls the actions of a character immersed in some well-defined world, usually involving some form of character development by way of recording statistics. Many role-playing video games have origins in tabletop role-playing games and use much of the same terminology, settings, and game mechanics. Other major similarities with pen-and-paper games include developed story-telling and narrative elements, player character development, complexity, as well as replay value and immersion. The electronic medium removes the necessity for a gamemaster and increases combat resolution speed. RPGs have evolved from simple text-based console-window games into visually rich 3D experiences.