Infu is a failed medical student on the verge of becoming an alcoholic. Due to his naturally gloomy personality, he has been living a depressing life and before the summer vacation, he finally faces the risk of repeating a grade. Meanwhile, he wins a ticket to travel to a tropical country in a lottery held by a credit card company. Infu throws everything away and goes on a trip in high spirits, but along the way he becomes involved in a mysterious series of murders. Will Infu be able to uncover the truth behind the incident? And will he be able to escape from the island!? Hurry up before you start experiencing withdrawal symptoms!