A feature film sequel, The Three Musketeers: Aramis the Adventure (アニメ三銃士 アラミスの冒険, Anime San Jūshi: Aramisu no Bōken, lit. The Three Musketeers: The Animation: Aramis' Adventure), was released in March 1989.
The TV series and the film are licensed by RetroCrush in the US for streaming, and are available on their website as well as on Prime Video.[2][3][4][5][6]
Plot
D'Artagnan leaves his hometown in the province of Gascony for Paris, in order to join the King's Musketeers or the Guards of the Cardinal. At his arrival, he gets into an argument with Athos, Porthos and Aramis and provokes them into a sword-fight. While fighting, they are interrupted by the Guards of the Cardinal, who are enforcing the King's decree banning duels. Afterwards, d'Artagnan and the others become friends and adopt the motto "All for one, and one for all".