[1] In 1973, he was cast in the Nippon TeleMovie Productions adaptation of Fujiko F. Fujio's Doraemon series as Takeshi Goda (Gian or Jaian), a strong and quick-tempered local bully who can fight at any time and with any kid he sees, especially Nobita.

Alongside co-stars Yoshiko Ota (Nobita Nobi), Masako Ebisu (Shizuka Minamoto), Shun Yashiro (Suneo Honekawa), Kōsei Tomita/Masako Nozawa (Doraemon), he voiced the character before the series was cancelled after 26 episodes.

From there he continued to voice the character in practically every adaptation made during his lifetime, the sole exception being the PlayStation 2 games from the early 2000s.

1979 saw Kimotsuki's return to the Doraemon franchise when he was cast in the 1979 anime series, this time as character Suneo Honekawa, a fox-faced (inherited from his mother) rich child who loves to flaunt his material wealth before everyone, especially Nobita, succeeding Yashiro in the Doraemon (1973 TV series) In 1991, he was cast in the children's anime Soreike!

Alongside co-stars Ryūsei Nakao (Baikinman) and Hiromi Tsuru (Dokinchan), they voiced the terrible trio together for 25 years until 2016.