He has appeared in many Japanese television dramas and movies; most notable is the TV series Water Boys.

He also appeared in Summer Time Machine Blues and Tokyo Friends: The Movie.

In 2009, Eita was cast in his first theatrical role playing a human in a romantic relationship with a female ghost.

[2] Nagayama is to appear with Jun Matsumoto and Masami Nagasawa in Hideki Noda's Sei sankaku kankei (正三角関係, Trilateral connection).

[3] On June 1, 2010, it was announced that Eita would marry singer Kaela Kimura, who was already five months pregnant, that summer after becoming engaged in late 2009.