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Naoto and the other K4 members head to Karuizawa for Advanced Railway Security Force Training. Naoto is excited to hear that they`ll have a course on operating an EF63 electric locomotive. Aoi accompanies him in shooting lessons and strength training, saying she doesn`t want him to slow her down as they`ll be working in railway security together, but Naoto tells her he`s aiming to be an engineer instead, leading to an argument.