In 2020, Tanimura moved to the Japan Football League club Iwaki FC.
[5] He made his debut for the club in August 2020, coming on as a late substitute in a 4-1 league defeat to Verspah Oita.
[7] Tanimura went on to make a few more short appearances throughout the rest of the season, playing 9 times across all competitions, scoring 3 goals in total.
In 2021, he played 24 games and scored 6 goals, as Iwaki were crowned champions of the JFL and were promoted to the J3 League for the first time in their history.
In spite of his relatively low amount of minutes played, he did manage to score 6 goals during the season, all of which came from appearing as a substitite.