The drama tells the story of a group of seven university students who travel to a deserted island where a strange decagonal mansion stands. It was the scene of a grisly mass murder six months earlier, and events soon turn ominous.

Yusuke Nogi of Ryosho's Energy Development Division said that 10 times the official down payment was mistakenly sent to GFL, a local infrastructure company involved in a solar energy plant to be built in the Balkan Republic in Central Asia. Suspected of involvement, he heads to the Balkan Republic to collect the difference of $90 million. With the cooperation of his CIA friend Sam, Nogi obtained information that the terrorist al-Zaer had laundered the full amount of the contract money into diamonds and brought it out.