Nagase and this lady were first caught by FRIDAY a year ago while on a yakiniku dinner date. However, her identity wasn't known at that time thus leading to speculation among fans over her. Nagase previously dated Hamasaki Ayumi and Aibu Saki but both relationships had since ended. When asked about this lady's relationship with Nagase, Johnny's Jimusho said that they are merely friends.
The article also mentioned that this lady is a violinist who met Nagase about a year ago when they both appeared in a TV music programme. She is said to come from a wealthy family where her father had retired from his managerial position in a big company while her mother is a musician.