After their battle with Glass, Naofumi and the other heroes have a meeting with the queen and Naofumi is shocked to learn about the seven star heroes. Still reeling from this revelation, more drama unfolds on the islands before Naofumi and his party can return to Melromarc. A massive monster bearing the appearance of a giant tortoise must be defeated. The monster is so powerful that even the mightiest adventurers cannot defeat him so what hope is there for Naofumi?