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.
Kintarō Yajima is a former leader of a motorcyle group and also a former tuna fisherman. He lived a wild and reckless life during his days as the leader of the motorcycle group. He now jumps to the corporate world and begins work as a salaryman.