"Starlight Vega is a fantasy comedy visual novel (an interactive fiction game) with GirlxGirl romances.
The first night exploring the upstairs study in her grandfather's old house, Aria accidentally frees a flirtatious demon girl named Lyria, who spent the past 50 years in a stone. The two become attached via a "Lifestone", which means Aria can't go far from Lyria, and vice versa. This gets quite awkward when Aria tries to go about (what's left of) her daily life.
To complicate things, the book she and her friend Melody also found that night seems to have ancient magic. Melody offers to see if the book can separate the link, however it isn't exactly in English, and the demon girl isn't keen on helping. Lyria's smart-mouthed servant, Sid, soon shows up, apparently having been searching for his Master in the human realm. Aria begrudgingly agrees to let the duo stay in her home.
Will Aria get caught up in Lyria's flirtatious behavior… or wonder if she has an ulterior motive? Will she stay friends with Melody or become something more?
"Starlight Vega" is an interactive story-based fiction available on PC, Mac, and Linux. Six different endings are obtainable through your choices made throughout the game."