Marvelous: Mōhitotsu no Takarajima (Nintendo Cinematic Universe)

Marvelous: Mohitototsu no Takarajima is a Japanese graphic novel.

Summary
After learning about the legend of Captain Maverick, three boys go on an adventure to find his treasure.

Plot Elements

 * Long ago, the seas were ruled by treasure-seeking pirates.
 * The most famous of these was the legendary Captain Maverick, who supposedly left a great treasure known as "Marvelous", guarded by unsolvable puzzles and bizarre creatures.
 * Countless adventurers have gone looking for the "Marvelous", but none have seen it and returned alive.
 * Many years later, a group of children on a field trip landed on the island, which was rumored to house the "Marvelous".
 * The boys find the "Marvelous" treasure and return home.