Celebrated Japanese animator Hayao Miyazaki is to return to feature film-making, despite having “retired” in 2013 following the completion of The Wind Rises for Studio Ghibli.

According to Anime News Network, Miyazaki revealed in a documentary that aired on Japanese TV on Sunday that he is working on a feature film called Kemushi no Boro (Boro the Caterpillar), derived from a short film project that Miyazaki had intended for the Ghibli Museum.

According to the documentary, Miyazaki felt that the CGI-animated Kemushi no Boro had potential as a feature, and so proposed it to Ghibli in August. According to the report, Miyazaki is aiming to complete the film by 2019, in time for the 2020 Tokyo Olympics..

Little is known about Kemushi no Boro, other than that Miyazaki describes it as “a story of a tiny, hairy caterpillar, so tiny that it may be easily squished between your fingers” – and that he has been working on the story for 20 years.

Work will continue on the short-form version, which is due to premiere in 2017. This would appear to be separate from the series of short films – recently expanded from nine to 12 – that Miyazaki has been making for the museum since 2005.