Juugo Shounen Hyouryuuki: Kaizoku-jima DE! Daibouken

十五少年漂流記 海賊島DE! 大冒険

Ryuutarou Nakamura's posthumous film based on Jules Verne's 1888 novel Two Years' Vacation.

A group of youngsters find themselves adrift at sea, and after a terrible storm they are cast upon a deserted island, where they must learn to get along with each other in order to survive.

(Source: AniList.co)