Sachi and Takara seem like any other high school sweethearts – sharing classes, weekend hangouts, and all the milestones of young love. But as their relationship deepens, a nagging unease begins to surface for Sachi. Driven by this growing feeling, she takes a pregnancy test, only to discover a life-altering truth in the bathroom of a distant restaurant: two red lines that will irrevocably change both her and Takara's future.