This erotic comedy follows the life of Haruo Maekawa, a young man who makes a living catching squid. Haruo is obsessed with catching a legendary giant squid rumored to live in Tokyo Bay. Haruo's uncle Takashi, fallen on hard times, comes to stay with his nephew until he can get back on his feet. Uncle Takashi is addicted to energy drinks, and seduces any woman in sight, including Haruo's girlfriend Rika. After making a sexual conquest, Uncle Takashi "marks his territory" by writing his name in red on the back of the woman. He takes a job as a pizza delivery man, but this job ends when he gets in an accident. While praying at a Shintō shrine, Uncle Takashi is bitten in the scrotum by a poisonous snake and dies. The uncle is destined to spend the afterlife in Hell unless his nephew and girlfriend can rescue him from the King of Hell