After joining a dangerous Arctic diving expedition, two marine biologists in a struggling marriage find themselves trapped under the ice pack with nothing but their trust in each other as a means to survive.

The night is very hot. Gang-Doo is having sex with Yoon-Ah, his girlfriend, but it doesn’t look like he is enjoying it. He tries to concentrate but the heat doesn’t allow him to keep going. He goes to the kitchen looking for refreshment, and when he rubs an ice cube over his skin he feels an intense arousal he's never felt before. He goes to the bathroom to avoid being discovered by his girlfriend, and there the ice cube rubbing against his body turns into an intense and beautiful experience full of pleasure, but ephemeral as the ice cube quickly melts away. After the ice cube melts, Gang-Doo goes back to his bed with Yoon-Ah, full of disappointment, guilt and confusion. She tells him she is worried that Gang-Doo doesn’t love her anymore but Gang-Doo tells her he is just irritated because of the heat. Gang-Doo and Yoon-Ah engage in their sex session again, but Gang-Doo still can’t feel arousal, and he can't get the thought of ice out of his mind until it overwhelms him.

在近未来的世界中，日本政府在东京沿岸设立了一个特别管制区，表面是做为经济特区的实验都市，但其实暗地在特区一所国际学校中，培养一批名为"UNDER THE DOG （败犬）"的特殊暗杀部队。总共有七名被称为"Flowers"的少男少女，他们各自拥有著常人所无法想像的特殊能力。 替政府到世界各地执行暗杀的UNDER THE DOG，并没有作战以外的选项，只要队员想要逃走或自杀，军方就会引爆设置在他们亲友头部的超小型炸弹，这群年轻人将抹杀掉所有感情，持续执行着只许成功不许失败的暗杀任务。

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