Ai decides to go for drinks with her new coworker, Nakahara, after their shift ends. Her husband is working late, they live in the same direction, and Nakahara is celebrating his first paycheck... those are the reasons Ai gives for going out. The alcohol flows, the conversation is lively, and when they check the time, it's 0:02 - they've missed the last train! Heavy rain pours outside, making it impossible to hail a cab. Then, her husband calls to say he can't come home tonight... Ai can no longer contain the wild beast within her. For the next few hours, until dawn arrives, she indulges in a passionate, intense affair under the cover of darkness.
