Gegege no Kitarou: Daikaijuu

When young Megumi Kawamura sends a letter asking Kitarou to investigate the whereabouts of her father, the young youkai immediately sets off to find him. As he arrives on Baruru Island, Kitarou discovers that for many years, any Japanese man who has set foot on the nearby mountain has been spirited away by the resident youkai, Akamata. As Kitarou heads into the jungle to rescue Megumi's father, he meets with the malevolent entity that proceeds to drain his very essence. Now, with the various youkai of Baruru Island preparing to wage war with Japan and invoking the power of their God, Zeokuronodon, Kitarou must try to stop them and return Mr. Kawamura to his daughter. Though, when the Baruru Island youkai force a strange drink upon him, will it even be possible? -Planet