KEIKO NIGAI - Sorairo days (Nakagawa Shoko cover)
KEIKO NIGAI - Houseki (FictionJunction KEIKO cover )
KEIKO NIGAI - Storia (Kalafina cover)
KEIKO NIGAI - Libera me from hell (Iwasaki Tarou cover)
KEIKO NIGAI - Ensei (FictionJunction cover)
( Mai Hime OST )Fiction Junction Yuki Kajiura Keiko Nigai - Ensei - Himeboshi
OST Tsubasa Reservoir Chronicle - Kaze no Machi he (Keiko Nigai)