Saya, formerly Senri Kuroki (aka Chisato Kuroki) is a 2nd-year wrestler, making her debut in October 2009 in JWP. As a rookie, not surprsingly she had been used primarily as a jobber in opening matches.
Kuroki missed 3+ months in mid-2010 (July-October) due to suffering from acid reflux disease, but returned on October 31, 2010 and soon afterwards picked up her first career win by pinning fellow rookie Moon Mizuki.
Kuroki left JWP on March 1, 2011, citing personal reasons/circumstances for her departure. She emphasized that she was not retiring and intends to return to wrestling at some point in the future. That return came fairly quickly, as she became a freelancer but also is expected to be a regular in the new REINA promotion. She became an official member of REINA on July 18, 2011-despite her losing her match she impressed GM Yumiko Hotta enough to earn a regular roster spot.
Kuroki announced on August 4, 2011 that she was changing her ring name to Saya effective immediately.

Stats & Info:
Real name: Saya Kurokawa
Age: 23
Height: 5’4″
Weight: 143 pounds/65 kg
Experience: 1 year
Finishing move: Unknown
Current affiliation: REINA

Official website (Japanese):