Hayashi Yuki, (林ゆうき), (Born December 31st 1980) is a Japanese music composer and arranger for rhythmic gymnastics, independent movies and TV drama. He used to be a rhythmic gymnast, and during University, he started out making music for shows, as a hobby for 5’000 yen a piece. Then, he got many request from other school students who liked his tunes, and quickly, he became a music producer of rhythmic gymnastics. After graduation, Hayashi Yuki was taught music for 6 months by a music producer of rhythmic gymnastics