Over the course of a single night in Tokyo, a series of lives briefly intersect in the quiet hours between midnight and dawn. Mari Asai, a college student unable to sleep, wanders the city and finds herself drawn into unexpected encounters—with a jazz musician, a hotel manager, and others moving through the margins of the night. Each interaction reveals fragments of hidden lives unfolding beyond the surface of the daytime world.

At the same time, Mari’s sister, Eri, lies in a mysterious, deep sleep from which she cannot be awakened. As the night progresses, her condition becomes increasingly strange, as if she exists somewhere between reality and another realm. The narrative shifts between these parallel threads, capturing moments that feel both ordinary and unsettling.

Sparse and atmospheric, After Dark explores isolation, connection, and the unseen rhythms of urban life. It is a quiet, nocturnal portrait of a city and its inhabitants, where fleeting encounters and unexplained events hint at deeper forces moving just out of sight.