This game is a choice-based visual novel. The story and its endings change based on the player's decisions. You can unlock different storylines through various choices at critical moments. What will your choice be? This game is a prequel to "Glass, " exploring the past and the formation of its universe. It delves into the background before the main events of the original story, set in a multi-dimensional world, offering a deep understanding of the main characters' motivations and relationships. It provides fans of "Glass" with an opportunity to experience the story from a new perspective.