Wall Sina, Goodbye is a visual novel written by Hiroshi Seko, released in the sixth Blu-ray release of the Attack on Titan anime as well as the compilation light novel Attack on Titan: Lost Girls. Other articles with this name include: * Wall Sheena, Goodbye arc - The first story arc of the Attack on Titan: Lost Girls manga. * Wall Sheena, Goodbye: Side Story - A side story concluding the Wall Sheena, Goodbye story arc.