Keiichiro Koyama

Koyama was born in Sagamihara, Kanagawa as the youngest of two children.

In 2007, he graduated from Meiji University's Department of History and Geography with a degree in Oriental History.^[2][3]

Upon entering Johnny's Entertainment on 21 January 2001, Koyama started out with the unit B.A.D. which stands for Beautiful American Dream. His second unit as a junior was B.B.D. which at first stood for Bad Boys Dancing, but was later changed to Best Beat Dancing. In October 2001, he was chosen as a member of Domoto Koichi's project, J-Support, alongside future fellow NEWS members Hironori Kusano and Shigeaki Kato. It was in this unit that Koyama started out as an announcer for shows such as the Ya-Ya-yah Show, and this has carried through to NEWS.

He is the oldest member of NEWS, which debuted in September 2003,^[4] and is often seen as the mother figure of the group.

From 2006 until March 2011, he hosted NHK's popular TV variety show Shounen Club (Boys Club) alongside KAT-TUN member Nakamaru Yuichi. The pair shared the screen 6 years later in Fuji TV's variety special program "Otasuke JAPAN", which aired on 14 June 2017.^[5]

He could be seen as a newscaster on NTV's "News Every", from 2010 until 2018.^[1][4]

Koyama learned sign language to interact with hearing-impaired children when he hosted NTV's "24 Hour TV" telethon in 2009, obtaining a test level 4.^[4]

He also occasionally participated in dramas, such as Fuji TV "Ns' Aoi" and "0-gōshitsu no kyaku",^[4] as well as guest starring in his bandmate Yamashita Tomohisa's drama Kurosagi.

Koyama opened a personal Twitter on 17 March 2023,^[6] and an official website on 22 February 2024.^[7]

On 8 June 2018, Koyama's entertainment career was halted. He attended a party where he gave an underage girl alcohol. The drinking age in Japan is 20 years old, and while she said she was 20 and legally able to drink, it was later discovered that she was in fact younger. This put his entire career on hold, including his entertainment activities with Johnny's Entertainment and his job as a newscaster for the program "News Every."

As of 27 June 2018, Koyama has resumed his entertainment activities. In December 2018, Koyama left the program "News Every."

According to acquaintances, Koyama is to marry AAA's Misako Uno by the end of 2024. The couple met through friends, and started dating by fall 2022.^[8] Koyama didn't deny the relationship when interviewed by Bunshun.^[9] According to said acquaintances (and as reported by Bunshun), both have been sharing their living spaces, semi-cohabitating, with the previous approval of family and agencies.^[8][9]

Koyama announced his marriage to AAA's Misako Uno on 12 March 2024. They registered their marriage on 12 March, which is also the birthday of Uno's beloved father, who died in January 2023.^[10]