At Princess Sophia's behest, Makoto Takatsuki faces off against the lava giant that's incinerating the capital. Not even the city's best warriors stand a chance, but Makoto uses his Synchro skill to access Sophia's king rank ice magic and strike a decisive blow! Having saved the day, Makoto is rewarded with the "Hero" title he's always dreamed of. It feels good to finally be recognized for his efforts, but being a hero comes with new trials to face. At least Sophia's icy exterior is starting to crack-but little does he realize that he's melted her heart completely! Once things settle down, the party takes a well-earned holiday to the sunny beaches of the Habhain Islands. Everyone vies for Makoto's attention, but he's more concerned about uncovering the ancient secrets that lurk beneath the waves...