Four boys are spending summer vacation by themselves at a remote boarding school. In an introductory sequence, the boy Yu is shown jumping off a cliff in a presumed suicide over his unrequited love for another of the boys, Kazuhiko. During the vacation period, a new boy, Kaoru, arrives. He looks just like Yu but insists he has no connection to him. The other boys, Naoto and Norio, are also attracted to Kazuhiko, who finds himself fascinated by Kaoru.