In Japan, there's an island where only naked, erotic beauties lived!! Kengo Inada, a third-rate office worker, had just been hired at a company when it was decided that he was going to be assigned to work across the sea at an isolated island called "Zenra Jima". However, that island turns out to be the one where all the inhabitants live with their pussies fully exposed, that "Zenra Jima", the Naked Island!! In contrast with the 3000 women living on the island, Kengo is the only man! On this island where a man hasn't been to in a long time, the native girls are swarming around Kengo's meat stick! On top of that, on the island grows an aphrodisiac fruit called Manmomo, where if eaten puts the girls and Kengo in an aroused state for 24 hours!! Just like that, Kengo gets by as the island's sole "mating man"; However, this island has a secret...!?