Nagasarete Airanto: Season 1

Following an argument with his father, Ikuto runs away from home. Along the way he boards a cruise ship and is knocked overboard in the ensuing storm. After drifting away out to sea, he eventually washes ashore on an island named "Airantou" by the locals.

The island is surrounded by whirlpools making any attempt at escape impossible, and likely life-threatening. Only women reside on this is...