Blue Delta is a visual novel about adventures in a strange world.

You are a traveler from a distant space, coming from the universe, or time, or death. Then you accidentally fell into this world - a world based on a triangular pyramid. With a bewildered mood, a local resident named Anthony discovered you and traveled with you in this world.

Players will encounter various creatures trapped in their own mental dilemmas, witness a plethora of illogical and stream-of-consciousness language, collect all kinds of strange items and interact with NPCs in various ways. Players can see different endings in different routes, witness the decline of this world - and, enjoy this moment.