About one gloomy girl named Mei who injures the most popular male student named Yamato. Somehow, Yamato likes Mei and one day, Yamato saves Mei from a stalker by kissing her. From that kiss, their love story begins.
From midnight to 5 AM, people gather at a high-end apartment in Roppongi to engage in promiscuous sexual activity. Story depicts the process of the men and women who meet for the first time there to have loveless sex.