The ship Guest was on encountered a mysterious storm and was wrecked. When the protagonist regains consciousness to the sound of waves and deep, gruff voices, they find themselves surrounded by a tribe of muscular beastmen many times their own size.

• About the Island Surrounded by rough seas, the climate is hot and humid tropical weather. There might be things washed up near the shore. The creatures living on this island are larger and stronger than normal.

• About the Tribe The island's tribe consists entirely of powerful male beastmen who are basically self-sufficient. Their basic attire consists of loincloths (sarongs), belts woven from animal hides, and ornaments with traditional patterns—a style that shows off rather than hides their muscular physiques. Their language is unique, and at first, you cannot understand what they are saying. However, as Guest teaches them words, they gradually become able to speak. Basically, they live in isolation from the outside world, protected by a unique barrier and the turbulent sea. They are wary of Guest, the first outsider to arrive, and are currently deciding how to handle them.

• Beliefs and Values Might is right... is not their way. Instead, they have a unique culture where a "strong body is a gift of life's abundance from Great Nature (the spirits), a proof of compassion used to protect comrades and survive the wild." Furthermore, they are very active in intimacy, and without exception, everyone has a strong libido. They perform such acts proudly and openly with anyone at any time. They consider it a noble thing that makes a strong body shine, and they see beauty in doing it roughly and intensely. Once a year, the whole tribe gathers for a large-scale "Ritual of Union" to express gratitude to nature.