Nagai Rui [The Big O Ost]
Nagai Rui [The Big O OST] — BIG-O! 03:12
Rui Nagai — the Big O 03:07
Nagai Rui — BIG-O! (KARAOKE VER.) 03:11
Nagai Rui [The Big O OST] — BIG-O! (SHOWTIME VER.) 01:15
Nagai Rui — Big-O! Show Must Go On (Extended) 05:55
Nagai Rui — BIG-O! 03:11
Rui Nagai — Big O! 03:10
Nagai Rui [The Big O OST] — BIG-O! (KARAOKE VER.) 03:12
Rui Nagai — Big - O 03:13
Nagai Rui — Big-O! Show Must Go On 01:15
Nagai Rui — BIG O! Show Must Go On (Anisong Collection Vol 1. Ver.) 03:52