This is the first title by Athena. Lisa’s father is the chairman of the military conglomerate ‘General Technics Group’, which plans to build an oil pipeline in central Asia with the backing of the U.S. government. However, they are opposed by the rival Russian financial group ‘Arsenary’ which will use any means to secure the deal. Ryou is an agent of the private military company ‘GMSS’ who is designated to protect Lisa with the help of fellow agent Reina. At the client’s request, he has to do this while undercover as a teacher at Lisa’s school Seika Gakuen.