On a mysterious island, a monument of great power was unearthed 18 years ago. This monument held data which only a select few could extract, and upon doing so, they became students at the island's school. These students had the ability to summon creatures for battle purposes. Among them was Satou Taketora, a typical lazy kid who had no ambitions and was ranked at the bottom of the class. However, fate had other plans for him when he was forced into a battle against his childhood friend. To everyone's amazement, Satou's summon had abilities far beyond their expectations.
