Synopsis
Maiku Kamishiro has always been uncertain about his origins. The sole hint he possesses regarding his family is a vintage photo depicting a boy and a girl playing in a small pool in front of a blue house. Driven by the desire to uncover his past, he relocates to that very blue house and takes a job as a programmer. His comfortable existence is disrupted when two distinct girls arrive at his doorstep, each holding a copy of the same photograph and asserting that they are his twin. Unable to determine which one is his actual relative and which is a stranger, Maiku permits both girls to move in with him until the truth can be revealed.