The Night Is Short, Walk On Girl

The film follows a night out for two university students: an unnamed woman (referred to as "kouhai" or "junior" throughout the film, and "The Girl with Black Hair" in the film's credits) and an unnamed man (referred to as "senpai" or "senior" in the film and its credits.) The senpai plans to confess his romantic feelings for the kouhai to her that night, though circumstances keep them separated for a majority of the evening.

The kouhai meets a pervert, Todo, at a bar. She wins the admiration of two other patrons, Higuchi and Hanuki, after punching Todo when he makes an advance on her. Higuchi and Hanuki lead the kouhai in gate crashing strangers' parties, where she drinks an impressive amount of alcohol. She later participates in a drinking game with Rihaku, a supernatural being, and wins. Read more on Wikipedia.