At the summit of a steep hill in the scenic town of Onomichi stands a building housing a lounge open to everyone. An eclectic group of amiable individuals gathers there, each carrying their own narratives. Tasuku Kaname is a distressed high school student prepared to take his own life after his classmates discovered he might be gay. As he questions his existence, he is utterly startled by the sight of a mysterious woman leaping from a nearby building. He rushes to the scene, only to find her unharmed, and soon learns she is the owner of the aforementioned building, known to all as Anonymous. Anonymous notices Tasuku's nervous disposition and offers to listen if he is willing to share his troubles. While talking with her, he realizes that his greatest pain stems from his inability to accept his sexuality. Emotional and heartfelt, Shimanami Tasogare presents a realistic look at Tasuku's struggles, alongside those of other lesbian, gay, bisexual, and transgender people, as they come to terms with themselves.