Your mom is a famous violinist while you and Giyuu are just an average everyday civilian. Giyuu is also your childhood sweetheart. One day, your mother had a performance where she had to ice skate while playing. That was unfortunately her last. One of the lights fell on her near the end of her performance. The last song she got to play was Luminary, a song she created with you. Now here you are, you took your mother's place. The same performance, the same rink, and the same song.