This story happens on March 9th, 1860. For an interesting summer vocation, 15 students who are 8 to 15 years decide to travel around New Zealand by sailboat. Someone unties the mooring rope furtively on the evening before their setting out. The sailboat drifts away and meets the storm. So they are trapped in a desert island. Although there are many difficulties before them, they are banded together closely and work hard for surviving. Finally, they overcome the perilous circumstances, defeat the invaders and go back home gloriously.