On Paradise Island, transformed into Hell Island after a massive explosion, the island's creatures have mutated into abominations. In this game, you will take on the role of Billy, a muscular bear who awakens with no memory of who he is. Billy decides to live by his own intent: to turn this island into his personal harem.

Players must search for mutated female members scattered across the island to join their party, while also unraveling the mysteries of themselves and the girls. Survive amidst various traps and confront the monstrous beings that inhabit this perilous world!