Higashide and An got to know each other and started dating after working on the NHK morning drama "Gochisousan". News of their romance first broke in January 2014 when An was spotted spending the New Year holidays at Higashide's hometown in Saitama.
The couple submitted their marriage application in the early hours of 1 Jan 2015 at a town office in Saitama Prefecture. According to insiders, both of them were not working on New Year's Eve thus they spent the day at Higashide's home in Saitama before submitting the marriage application together.
Source: Sponichi / Sanspo