After working at the studio for eighteen months, he joined Shin-Ei Animation on the recommendation of the president Keijiro Kurokawa. At Shin-Ei he began working on a TV series Kaibutsu-kun as a production manager, then was moved to Doraemon. There for the first time he took on the role of animation director. In working on Doraemon, he was influenced by the chief director Tsutomu Shibayama. Since Hara admired Fujiko Fujio, Doraemon’s original author, he worked hard and became known for improving quality. He appeared in an animation magazine as a new director to look out for. After Obake no Q Taro and Doraemon, he was chosen as chief director of Esper Mami and worked for this TV series for two and a half years. When Esper Mami ended, he took a break for ten months. Then he returned by working on 21 emon. After 21 emon, he worked on Crayon Shin-chan. For “Shin-chan” he did direction and continuity both for the TV series and the movies, becoming director in October 1996. The 2001 Crayon Shin-chan movie Crayon Shin-chan: The Storm Called: The Adult Empire Strikes Back earned critical praise, and raised his profile. The following year’s Crayon Shin-chan: The Storm Called: The Battle of the Warring States was commended by the Agency for Cultural Affairs.

As of 2012 Hara has begun shooting his first live-action film, Hajimari no Michi, which was released in June,2013.