Step into the Hatcho Detective Agency and help protect a legendary treasure. You are hired as a part-time assistant to the music detective Hatcho Shirabe, working in a tranquil town where crime is rare but curiosity runs deep. When a chilling email arrives from a phantom thief calling himself Canon, the target is an ancient sheet music housed in the Music Culture Museum—an artifact with a millennium of history. You, Shirabe, the sharp-witted director, and your loyal assistant Ellen set out to guard the priceless score and uncover the thief’s true motives.

About the game

八長調といにしえの楽譜 is a music mystery adventure game driven by sound and storytelling. As Shirabe’s assistant, you solve puzzles by listening, interpreting melodies, and reading the way music and notation intertwine with clues. The phantom thief Canon challenges you to read between the lines of old scores, decipher hidden messages, and follow sonic traces through museum halls, practice rooms, and archive corridors.

Gameplay and mystery

This is a story-driven adventure where exploration and deduction carry the momentum. Players gather evidence through ear-solving puzzles that rely on audio cues, sheet music fragments, and instrument performances. By listening carefully, you match sounds to symbols, reconstruct musical phrases, and unlock doors to hidden rooms. Through conversations with teammates and museum staff, you piece together the thief’s motives and the history behind the score.

Key features

• Original puzzles solved by distinguishing sounds and musical cues
• Mechanics centered on sheet music, notation, and instrument performances
• A compact, bright mystery with a light-hearted worldview
• Exploration-led progression guided by dialogue, discovery, and deduction
• Accessible hint system so players with varying pitch knowledge can enjoy the story

Join Shirabe, the director, and Ellen as you navigate the museum’s secrets, protect a historic score, and reveal how sound can drive a compelling mystery. Expect a thoughtful blend of musical puzzle craftsmanship, intriguing conspiracies, and a world that shines with curiosity and optimism.