Oshima Keiko (大島 恵子) is a former firefighter, as the protégé of SASUKE All-Star Takeda Toshihiro, she made appearance only two times in KUNOICHI.
Her made debut in KUNOICHI 2007 received #62, she made all the way to Hasso Tobi of the First Stage, and ended up failed when she was too tired to keep on yellow post. Then in KUNOICHI 2009, her performance got strong than the last tournament, she was shockingly unable to catch up with Hayashi Natsumi and Kawahara Ayako (the latter being Muscle Musical member) and resultantly was eliminated when the latter two competitors completed before her, she haven't complete since.
Whist she never cleared the First Stage of KUNOICHI. Oshima and Okamoto Sayaka is the only All-Star protégés to have multiple appearances in KUNOICHI.