The “realist” aesthetic and approach of the show was possible thanks to its director, who in fact debuted as chief director: the second of the three Yoshida brothers, Ippei Kuri. Largely overshadowed by the other two rising anime directors of the time that were Isao Takahata (in Tôei) and Osamu Dezaki (in Mushi), Kuri was easily on par with them in terms of artistic vision; one may even argue that him and Tatsunoko’s artists and technicians largely laid the ground that would make Dezaki’s expressionist style possible. In that regard, Sanshirô can be read as a site for formal and technical experimentation, wherein “realism” was but one of the many aspects that were explored.
Many of Tôei’s promising artists, who had for the most part worked on Fujimaru, were determined to follow up on the possibilities the TV show had opened. This meant making a decisive move towards “adult” animation, that is complex storylines, visual experimentations, and a kind of animation that would go beyond the simplistic, round and friendly shapes of the characters of so-called “TV manga”. Just like young manga artists in the 60s had rejected Osamu Tezuka’s "story manga" style to create their own graphic novels called gekiga, artists in Tôei would slowly start making the move towards what would later be called gekiga anime.