Kei Moriya’s father Osamu (62) was the former Minister of Economy, Trade and Industry. His mother Kimie was a senior director at KnK International "Children without Borders." She became ill while visiting Cambodia for the organization in July 2015 and died after transferring to Thailand. Kei succeeded his mother's position at KnK this March.
Princess Hisako is also acquainted with Osamu Moriya as he was in London in 1975 when she studied aboard at Cambridge University.
Kei spent his kindergarten period in Paris and also studied abroad at Oxford University while enrolled at Keio University. He lives with his father and grandmother. He's been working for NYK since 2009, where he's in charge of wood chip transportation, and was featured that year in the company newsletter. A colleague says Kei is proficient in English and believes he’ll be a serious and good husband like his work.
Media began gathering at Moriya's apartment building in the afternoon; they waited several hours as Kei returned home after 9:30pm. He didn’t say much, thanked the crowds and media’s “congratulations” and bowed.
Cello instructor Yoshihiko Terada was among those congratulating the couple. In August 1993, Mr. Terada began giving cello lessons to Prince Takamado who wanted to start learning before turning 40. While her sisters Tsuguko and Noriko selected violin and piano, Ayako wanted to learn after listening to her father's cello sessions. Mr. Terada remembers Ayako practicing hard in front of a large mirror in a reception room at the Takamado residence. She was serious from a young age.
When Prince Takamado suddenly passed away in November 2002, Mr. Terada and Princess Ayako played cello in front of his coffin before the general viewing. She continued cello lessons until university.
Sources:
Sankei,
Sankei 2,
Mainichi,
Jiji,
Jiji 2
The photos released by the IHA were taken on May 17 (Ayako) and June 9 (Kei):
http://www.sankei.com/images/news/180626/lif1806260035-p2.jpg
http://www.sankei.com/images/news/180626/lif1806260035-p3.jpg
Kei Moriya greeting media on June 26:
https://www.jiji.com/news/photos/photo_news/images/658/0027476176.jpg
https://www.jiji.com/news/photos/photo_news/images/658/0027476497.jpg
ETA: Photos of Kei visiting Cambodia and silk garment workers in January 2016:
Jiji,
Asahi