Keiichi was born on December 11, 1977 in Tokyo, Japan, to Masahiro Enomoto, a businessman, and Hideko Enomoto, grand daughter of Ikebana master. Keiichi's early film influence were
Castle in the Sky (1986),
The Goonies (1985),
Indiana Jones and the Temple of Doom (1984) and
Star Wars: Episode VI - Return of the Jedi (1983).
In 2012, Keiichi was cast as Sakamoto, a chief officer in
The Railway Man (2013). He acted beside
Jeremy Irvine. He then played a ninja in
The Wolverine (2013) alongside
Hugh Jackman. In 2013, he was cast as Omori Guard in
Unbroken (2014), and worked under the direction of
Angelina Jolie.
In 2017, he was featured as main cast in
The 48 Hour Destination (2017), a TV series episode.
He then worked on several feature films, including
Dora and the Lost City of Gold (2019) with
Isabela Merced,
Love and Monsters (2020) with
Dylan O'Brien,
Expired (2022) with
Hugo Weaving,
Godzilla vs. Kong (2021) with
Millie Bobby Brown, and
Young Rock (2021) with
Joseph Lee Anderson.