Japan’s Princess Mako, the emperor’s niece, married her college sweetheart on Tuesday, giving up her royal title and saying she was determined to build a happy life with her “irreplaceable” husband after a tumultuous engagement.In a news conference with new husband and commoner Kei Komuro marked by unusual candor for Japan’s royal family, Mako said her marriage to Komuro had been inevitable despite the widespread opposition to it.Mako – now known as Mako Komuro – was diagnosed with post-traumatic stress disorder (PTSD) earlier this year after an engagement plagued by a money scandal, intense media scrutiny and a three year separation from her fiance.“Kei is irreplaceable for me.