While riding his bike back from college, the protagonist is left traumatized after witnessing a fatal accident. A young girl is hit by a vehicle while crossing the street, and her friend nonchalantly puts away her game before attending to the victim. The incident leaves the protagonist shaken and perplexed about the true significance of the event and the intentions of the mysterious girl he refers to as "U.U." Shoujo Fujuubun, based on ISIN NISIO's novel, centers around a budding writer's unsettling encounter with "U.U." As it explores significant topics such as the quest for meaning and the practical application of art, it goes beyond being simply a psychological thriller.