The storyline of Stella Sora centers on the player, who is an amnesiac demon lord called the "Tyrant," and their adventures with the "New Star Guild," a trio of girls. Players journey through the fantasy world of Nova, exploring mysterious "Monoliths," and discovering the stories of other charming girls called "Trekkers". Interactions with the Trekkers through a chat system build intimacy, unlock additional dialogue, and reveal their backstories.