Her real name is Daigorou Gondou. She is an old friend of Yaegashi's and works as an S&M Queen under the name of Miss Jasmine Mariko. Yaegashi calls her up to spice things up for Mizuho's birthday.
In "Crystal Harem", it is revealed that Jasmine's day job is at her own fortune telling compay. She offers Yajima assistance with some cases, and has known Ryou for a long time.