Friends: Naki on Monster Island (Friends: Mononokeshima no Naki) (2011)

Offshore, shrouded in fog, there is a mysterious island that is said to be the home of a family of monsters. It is strictly forbidden to approach it. But one day a human child, Mushroom, it loses and coming face to face with the mysterious creatures that live there. The arrival of Mushroom, makes panic on the island because the monsters are actually terrified of living humans.