In to Yuu no Jikenbo Mizu Shimi

Two individuals, In and Yuu, become brothers under particular circumstances and face an unusual situation. Yuu, who lost his ability to speak after a previous event and shows little emotional response, frustrates In. When In learns that Yuu has become stuck in an elevator at his part-time job, he becomes involved in a series of strange occurrences. The narrative explores the enigmatic supernatural elements connected to the pair.