Gakushi Fujikawa is a Japanese pianist, keyboardist, arranger, music director, and composer, celebrated for his emotive playing style and versatility. He is particularly known for his performance of the ONE OK ROCK's "Renegades (Piano Version)", where his delicate touch and dynamic expression bring a new emotional depth to the song. Beyond ONE OK ROCK, he has supported prominent Japanese artists such as AI, ENDRECHERI, Toshinobu Kubota, Miliyah Kato, and DA PUMP, earning a strong reputation in Japan's live music scene.

As a recurring live support musician for ONE OK ROCK, Gakushi provides piano accompaniment that enhances the band's ballads and atmospheric moments. His work has appeared in intimate theater performances, massive dome tours, and special arrangements like the piano rendition of Renegades. From the LONE OK ROCK 2023 LUXURY DISEASE JAPAN TOUR to select special events, his elegant playing adds a unique emotional layer to the band's live sound, making him a respected part of their extended musical circle.