日本少女朋子（Hiroe Takei 饰）怀着成为潜水员的梦想来到伦敦，但是人生地不熟加上语言不通，使朋子的英国之旅遇到许多困难。她好不容易找到一间古旧的公寓，冰冷湿滑的伦敦街道还一时无法适应，朋子只得在房间内穿上泳衣，听着英语学习磁带打法无聊的时光。 次日，她走出公寓，来到潜水员训练馆，惊慌失措间她无意中滑到，头部撞倒泳池边缘，人落进水里。恍惚间，朋子在巨大水母的裹挟之下来到海底，看到了飞驰的列车和演奏美妙音乐的怪人。最终她得到了一个闪耀奇特光芒的仙女棒，奇迹随之发生……

A woman tells her story. She can't sleep. She works in a sushi shop in a seaside city. We see fishing boats arrive, fish sorted and sold at market, then chopped and boxed at the factory. At her shop, live fish swim in tanks. She's tired. She tries various methods to break her insomnia, none are successful. Late one night, two weeks into her ordeal, she rides her motor scooter at top speed into a realm of discovery. Will sleep and insight be of help? BAFTA winner