Part 2/7:
The story kicks off with a boy named Tei, who dreams of discovering the renowned Monster Island. Ignoring cautious whispers regarding the dangers of venturing into a cave, he sails into the heart of the natural wonder. As he enters, the current pulls him deeper into the cave, ultimately leading him to the fabled island itself.
Once ashore, Tei is elated until he realizes his younger brother, Kodak, has stowed away on his boat. Motivated by a desire to collect valuable giant mushrooms to buy medicine for their ailing mother, the brothers venture into the island's inhospitable forests. Their excitement is short-lived as they soon encounter lurking monsters, prompting a harrowing escape back to the boat, but not without Kodak being left behind—an event that changes the course of their story.