Kaya Koji - Transformers Victory
Koji Kaya - - Transformers - Victory (opening)(Transformers OST)
Koji Kaya - Transformer Victory
Yusa Koji & Matsutani Kaya - Fuyu no Hanabi
Yusa Koji feat. Matsutani Kaya - Fuyu no Hanabi
Ichimaru Gin (Yusa Koji) feat. Matsumoto Rangiku (Kaya Matsutani) (Bleach) - Fuyu no Hanabi
Ichimaru Gin (CV: Yusa Koji) and Matsumoto Rangiku (CV: Matsutani Kaya) - Fuyu no Hanabi (冬の花火)