Gegege no Kitarou (1996)

Kitarou, a ghost, spends his afterlife helping humans in need of his skills. He thwarts the plans of evil spirits who live to torment humanity. This time, Kitarou's friend Megumi is in need of his help. Her father, a botanist, went to Baruru Island to study the plant life there, and was subsequently kidnapped by evil spirits. It's up to Kitarou to save him.