Marriage equality has not yet come to Japan.
Ichinose came out as a lesbian in "FLASH" magazine in April 2009, but her future bride has been less public about her sexuality. Sugimori has previously said she likes woman "over 90%."
Still, the marriage announcement startled conservative Japan, where LGBT rights lag behind many other nations.
The women said they met in October 2012 in a gay bar in Shinjuku, Tokyo and moved in together as a couple in spring of 2013, according to Sankei Sports newspaper.
"We hope that same-sex marriage will be legal in Japan too, and it will be great if our wedding ceremony could be one step forward for it," Ichinose said in a statement release through her agency.