Based on the popular mystery novel by Shichiri Nakayama, Good-bye Debussy tells the story of cousins Haruka and Lucia, who are more like sisters.

After Lucia’s parents go missing while volunteering in Africa, she becomes a part of Haruka’s family. Haruka, an aspiring pianist, makes a promise to Lucia to one day play Claude Debussy’s ‘Moonlight Sonata’ for her. After Haruka sustains near-fatal injuries in a devastating fire in which Lucia and her grandfather perish, she’s determined to play the piano and keep her promise to Lucia.

Enter Yosuke Misaki, a professional pianist with a mysterious past, who helps teach Haruka through rehabilitation to be able to perform again one day. But after Haruka is informed of a large inheritance due to the fire, a series of suspicious accidents start to occur, leading Yosuke to believe Haruka might be in danger.

But the biggest mystery is yet to be solved…

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